Monday, 20 February 2012

Grab jobs from Freelancer

Grab jobs from Freelancer
This task use java and jsoup to grab jobs from Freelancer
Grab jobs from Freelancer
  1. Create Freelancer class as following
  2. Call Freelancer.grab() method as following
Call Freelancer.grab() method
1List<Freelancer.Job> jobs = Freelancer.grab();
2for (int i = 0; i < jobs.size(); i++) {
3 logger.info(jobs.get(i).toString());
4}
List<Freelancer.Job> jobs = Freelancer.grab();
for (int i = 0; i < jobs.size(); i++) {
    logger.info(jobs.get(i).toString());
}
Freelancer class
1public class Freelancer {
2
3 private static Logger logger = Logger.getLogger(Freelancer.class);
4
5 public static List<Job> grab() {
6 List<Job> jobs = new ArrayList<Job>();
7 try {
8 String link = "http://api.freelancer.com/Project/Search.xml?order=submitdate&order_dir=desc";
9 Document doc = Jsoup.parse(new URL(link), 60000);
10 Elements elements = doc.select("item");
11 Element element = null;
12 for (int i = 0; i < elements.size(); i++) {
13 element = elements.get(i);
14 Job job = new Job();
15 if (element.select("id").first() == null) continue;
16 job.id = element.select("id").first().text();
17 job.url = element.select("url").first().text();
18 job.title = element.select("name").first().text();
19 job.shortDesc = element.select("short_descr").first().text();
20 job.data.put("Start date:", element.select("start_date").first().text());
21 job.data.put("End date:", element.select("end_date").first().text());
22 job.data.put("Buyer url:", element.select("buyer url").first().text());
23 job.data.put("Buyer id:", element.select("buyer id").first().text());
24 job.data.put("Buyer username:", element.select("buyer username").first().text());
25 job.data.put("Featured:", element.select("options featured").first().text());
26 job.data.put("Non-public:", element.select("options nonpublic").first().text());
27 job.data.put("Trial:", element.select("options trial").first().text());
28 job.data.put("For gold members:", element.select("options for_gold_members").first().text());
29 job.data.put("Hidden bids:", element.select("options hidden_bids").first().text());
30 job.data.put("Min budget:", element.select("budget min").first().text());
31 job.data.put("Max budget:", element.select("budget max").first().text());
32 Elements eles = element.select("jobs item");
33 String vals = "";
34 for (int j = 0; j < eles.size(); j++) {
35 if (vals.length() > 0) vals += ", ";
36 vals += eles.get(j).text();
37 }
38 job.data.put("Jobs:", vals);
39 jobs.add(job);
40 }
41 } catch (Exception e) {
42 logger.error("", e);
43 }
44 return jobs;
45 }
46
47 public static class Job {
48 public String id = "";
49 public String title = "";
50 public String shortDesc = "";
51 public String url = "";
52 public Map<String, String> data = new HashMap<String, String>();
53
54 public String toString() {
55 String tag = "\r\n";
56 tag += "Id: " + id + "\r\n";
57 tag += "Title: " + title + "\r\n";
58 tag += "Url: " + url + "\r\n";
59 tag += "Short Desc: " + shortDesc + "\r\n";
60 for (String key : data.keySet()) {
61 tag += key + " " + data.get(key) + "\r\n";
62 }
63 return tag;
64 }
65 }
66
67}
public class Freelancer {

    private static Logger logger = Logger.getLogger(Freelancer.class);
     
    public static List<Job> grab() {
        List<Job> jobs = new ArrayList<Job>();
        try {
            String link = "http://api.freelancer.com/Project/Search.xml?order=submitdate&order_dir=desc";
            Document doc = Jsoup.parse(new URL(link), 60000);
            Elements elements =  doc.select("item");
            Element element = null;
            for (int i = 0; i < elements.size(); i++) {
                element = elements.get(i);
                Job job = new Job();
                if (element.select("id").first() == null) continue;
                job.id = element.select("id").first().text();
                job.url = element.select("url").first().text();
                job.title = element.select("name").first().text();
                job.shortDesc = element.select("short_descr").first().text();
                job.data.put("Start date:", element.select("start_date").first().text());
                job.data.put("End date:", element.select("end_date").first().text());
                job.data.put("Buyer url:", element.select("buyer url").first().text());
                job.data.put("Buyer id:", element.select("buyer id").first().text());
                job.data.put("Buyer username:", element.select("buyer username").first().text());
                job.data.put("Featured:", element.select("options featured").first().text());
                job.data.put("Non-public:", element.select("options nonpublic").first().text());
                job.data.put("Trial:", element.select("options trial").first().text());
                job.data.put("For gold members:", element.select("options for_gold_members").first().text());
                job.data.put("Hidden bids:", element.select("options hidden_bids").first().text());
                job.data.put("Min budget:", element.select("budget min").first().text());
                job.data.put("Max budget:", element.select("budget max").first().text());
                Elements eles = element.select("jobs item");
                String vals = "";
                for (int j = 0; j < eles.size(); j++) {
                    if (vals.length() > 0) vals += ", ";
                    vals += eles.get(j).text();
                }
                job.data.put("Jobs:", vals);
                jobs.add(job);
            }
        } catch (Exception e) {
            logger.error("", e);
        }
        return jobs;
    }
        
    public static class Job {
        public String id = "";
        public String title = "";
        public String shortDesc = "";
        public String url = "";
        public Map<String, String> data = new HashMap<String, String>();
         
        public String toString() {
            String tag = "\r\n";
            tag += "Id: " + id + "\r\n";
            tag += "Title: " + title + "\r\n";
            tag += "Url: " + url + "\r\n";
            tag += "Short Desc: " + shortDesc + "\r\n";
            for (String key : data.keySet()) {
                tag += key + " " + data.get(key) + "\r\n";
            }
            return tag;
        }
    }
     
}
Java jsoup

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Posted by at 22:32 0 comments
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Grab jobs from vWorker

Grab jobs from vWorker
This task use java and jsoup to grab jobs from vWorker
Grab jobs from vWorker
  1. Create vWorker class as following
  2. Call vWorker.grab() method as following
Call vWorker.grab() method
1List<vWorker.Job> jobs = vWorker.grab(1);
2for (int i = 0; i < jobs.size(); i++) {
3 vWorker.Job job = jobs.get(i);
4 logger.info(job.toString());
5}
List<vWorker.Job> jobs = vWorker.grab(1);
for (int i = 0; i < jobs.size(); i++) {
    vWorker.Job job = jobs.get(i);
    logger.info(job.toString());
}
vWorker class
1public class vWorker {
2
3 private static Logger logger = Logger.getLogger(vWorker.class);
4
5 public static List<Job> grab(int maxpage) {
6 List<Job> jobs = new ArrayList<Job>();
7 try {
8 boolean stop = false;
9 int pageno = 0;
10 String link = "http://www.vworker.com/RentACoder/DotNet/misc/BidRequests/ShowBidRequests.aspx?lngBidRequestListType=3&optSortTitle=2&lngBidRequestCategoryId=-1&txtMaxNumberOfEntriesPerPage=10&optBidRequestPhase=2&lngSortColumn=-6&blnModeVerbose=True&optBiddingExpiration=1&intTabSelectedId=2";
11 while (!stop) {
12 Document doc = Jsoup.parse(new URL(link), 60000);
13 Elements elements = null;
14 Element element = null;
15
16 elements = doc.select("a");
17 for (int i = 0; i < elements.size(); i++) {
18 element = elements.get(i);
19 String val = element.attr("href");
20 String pattern = "/RentACoder/misc/BidRequests/ShowBidRequest.asp?lngBidRequestId=";
21 int pos = val.indexOf(pattern);
22 if (pos < 0) continue;
23 String code = val.substring(pos + pattern.length());
24 String title = element.text();
25 if (!element.parent().tagName().equals("font")) continue;
26 if (!element.parent().parent().tagName().equals("td")) continue;
27 Node parent = element.parent().parent().parent().nextSibling().nextSibling();
28 Document pdoc = Jsoup.parse(parent.outerHtml());
29 String shortDesc = pdoc.text();
30 Job job = new Job();
31 job.id = code;
32 job.title = title;
33 job.shortDesc = shortDesc;
34 jobs.add(job);
35 }
36
37 elements = doc.select("input[name=cmdNextPage]");
38 if (elements.size() == 0) {
39 stop = true;
40 } else {
41 element = elements.get(0);
42 String val = element.attr("onclick");
43 int pos = val.indexOf("action='");
44 if (pos < 0) {
45 stop = true;
46 continue;
47 }
48 val = val.substring(pos + 8);
49 pos = val.lastIndexOf("'");
50 if (pos < 0) {
51 stop = true;
52 continue;
53 }
54 val = val.substring(0, pos);
55 link = val;
56 pageno++;
57 if (pageno >= maxpage) {
58 stop = true;
59 }
60 }
61 }
62
63 for (int i = 0; i < jobs.size(); i++) {
64 Job job = jobs.get(i);
65 link = "http://vworker.com/RentACoder/misc/BidRequests/ShowBidRequest.asp?lngBidRequestId=" + job.id + "&intProjectTab_TabId=1";
66 Document doc = Jsoup.parse(new URL(link), 60000);
67 Elements elements = null;
68 Element element = null;
69 element = doc.select("#idTabstripContent").first();
70 if (element != null) {
71 elements = element.select("td");
72 String[] fields = new String[] { "Non-action ratio:", "Employer security verifications:", "Approved on:", "Bidding closes:", "Viewed (by workers):", "Deadline:", "Phase:", "Sourcing type:", "Payment Model:", "Max Accepted Bid:", "Expert Guarantee:", "Estimated size:", "Bidding type:", "Accepted bidder economy type(s):", "Accepted english fluency(ies):", "ExpertRating requirement:", "Project management:" };
73 List<String> fieldList = new ArrayList<String>();
74 for (int j = 0; j < fields.length; j++) {
75 fieldList.add(fields[j]);
76 }
77 for (int j = 0; j < elements.size(); j++) {
78 String field = elements.get(j).text();
79 String value = "";
80 if (j + 1 < elements.size()) {
81 value = elements.get(j + 1).text();
82 }
83 if (fieldList.indexOf(field) >= 0) {
84 job.data.put(field, value);
85 }
86 }
87 elements = doc.select("b");
88 for (int j = 0; j < elements.size(); j++) {
89 element = elements.get(j);
90 String name = element.text().trim();
91 if ("Brief summary:".equals(name)) {
92 element = element.nextElementSibling().nextElementSibling();
93 if (element.html().indexOf("<a name=\"NoWorkInAdvance\">") >= 0) {
94 element = element.nextElementSibling();
95 }
96 job.longDesc = element.html();
97 }
98 }
99 }
100 }
101 } catch (Exception e) {
102 logger.error("", e);
103 }
104 return jobs;
105 }
106
107 public static class Job {
108 public String id = "";
109 public String title = "";
110 public String shortDesc = "";
111 public String longDesc = "";
112 public Map<String, String> data = new HashMap<String, String>();
113
114 public String toString() {
115 String tag = "\r\n";
116 tag += "Id: " + id + "\r\n";
117 tag += "Title: " + title + "\r\n";
118 tag += "Short Desc: " + shortDesc + "\r\n";
119 tag += "Long Desc: " + longDesc + "\r\n";
120 for (String key : data.keySet()) {
121 tag += key + " " + data.get(key) + "\r\n";
122 }
123 return tag;
124 }
125 }
126}
public class vWorker {

    private static Logger logger = Logger.getLogger(vWorker.class);
     
    public static List<Job> grab(int maxpage) {
        List<Job> jobs = new ArrayList<Job>();
        try {
            boolean stop = false;
            int pageno = 0;
            String link = "http://www.vworker.com/RentACoder/DotNet/misc/BidRequests/ShowBidRequests.aspx?lngBidRequestListType=3&optSortTitle=2&lngBidRequestCategoryId=-1&txtMaxNumberOfEntriesPerPage=10&optBidRequestPhase=2&lngSortColumn=-6&blnModeVerbose=True&optBiddingExpiration=1&intTabSelectedId=2";
            while (!stop) {
                Document doc = Jsoup.parse(new URL(link), 60000);
                Elements elements =  null;
                Element element = null;
              
                elements = doc.select("a");
                for (int i = 0; i < elements.size(); i++) {
                    element = elements.get(i);
                    String val = element.attr("href");
                    String pattern = "/RentACoder/misc/BidRequests/ShowBidRequest.asp?lngBidRequestId=";
                    int pos = val.indexOf(pattern);
                    if (pos < 0) continue;
                    String code = val.substring(pos + pattern.length());
                    String title = element.text();
                    if (!element.parent().tagName().equals("font")) continue;
                    if (!element.parent().parent().tagName().equals("td")) continue;
                    Node parent = element.parent().parent().parent().nextSibling().nextSibling();
                    Document pdoc = Jsoup.parse(parent.outerHtml());
                    String shortDesc = pdoc.text();
                    Job job = new Job();
                    job.id = code;
                    job.title = title;
                    job.shortDesc = shortDesc;
                    jobs.add(job);
                }
              
                elements = doc.select("input[name=cmdNextPage]");
                if (elements.size() == 0) {
                    stop = true;
                } else {
                    element = elements.get(0);
                    String val = element.attr("onclick");
                    int pos = val.indexOf("action='");
                    if (pos < 0) {
                        stop = true;
                        continue;
                    }
                    val = val.substring(pos + 8);
                    pos = val.lastIndexOf("'");
                    if (pos < 0) {
                        stop = true;
                        continue;
                    }
                    val = val.substring(0, pos);
                    link = val;
                    pageno++;
                    if (pageno >= maxpage) {
                        stop = true;
                    }
                }
            }
          
            for (int i = 0; i < jobs.size(); i++) {
                Job job = jobs.get(i);
                link = "http://vworker.com/RentACoder/misc/BidRequests/ShowBidRequest.asp?lngBidRequestId=" + job.id + "&intProjectTab_TabId=1";
                Document doc = Jsoup.parse(new URL(link), 60000);
                Elements elements =  null;
                Element element = null;
                element = doc.select("#idTabstripContent").first();
                if (element != null) {
                    elements = element.select("td");
                    String[] fields = new String[] { "Non-action ratio:", "Employer security verifications:", "Approved on:", "Bidding closes:", "Viewed (by workers):", "Deadline:", "Phase:", "Sourcing type:", "Payment Model:", "Max Accepted Bid:", "Expert Guarantee:", "Estimated size:", "Bidding type:", "Accepted bidder economy type(s):", "Accepted english fluency(ies):", "ExpertRating requirement:", "Project management:" };
                    List<String> fieldList = new ArrayList<String>();
                    for (int j = 0; j < fields.length; j++) {
                        fieldList.add(fields[j]);
                    }
                    for (int j = 0; j < elements.size(); j++) {
                        String field = elements.get(j).text();
                        String value = "";
                        if (j + 1 < elements.size()) {
                            value = elements.get(j + 1).text();
                        }
                        if (fieldList.indexOf(field) >= 0) {
                            job.data.put(field, value);
                        }
                    }
                    elements = doc.select("b");
                    for (int j = 0; j < elements.size(); j++) {
                        element = elements.get(j);
                        String name = element.text().trim();
                        if ("Brief summary:".equals(name)) {
                            element = element.nextElementSibling().nextElementSibling();
                            if (element.html().indexOf("<a name=\"NoWorkInAdvance\">") >= 0) {
                                element = element.nextElementSibling();
                            }
                            job.longDesc = element.html();
                        }
                    }
                }
            }
        } catch (Exception e) {
            logger.error("", e);
        }
        return jobs;
    }
     
    public static class Job {
        public String id = "";
        public String title = "";
        public String shortDesc = "";
        public String longDesc = "";
        public Map<String, String> data = new HashMap<String, String>();
         
        public String toString() {
            String tag = "\r\n";
            tag += "Id: " + id + "\r\n";
            tag += "Title: " + title + "\r\n";
            tag += "Short Desc: " + shortDesc + "\r\n";
            tag += "Long Desc: " + longDesc + "\r\n";
            for (String key : data.keySet()) {
                tag += key + " " + data.get(key) + "\r\n";
            }
            return tag;
        }
    }
}
Java jsoup

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Posted by at 19:54 0 comments
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Friday, 17 February 2012

Extract summary of web page

Extract summary of web page
This task use java and jsoup to extract summary of web page.
Extract summary of web page
  1. Create Summary class as following
  2. Call Summary.extract() method as following
Call Summary.extract() method
1String link = "http://forums.digitalpoint.com";
2Document doc = Jsoup.parse(new URL(link), 60000);
3String sum = Summary.extract(doc);
4logger.info(sum);
String link = "http://forums.digitalpoint.com";
Document doc = Jsoup.parse(new URL(link), 60000);
String sum = Summary.extract(doc);
logger.info(sum);
Summary class
1public static class Summary {
2
3 public static String extract(Document doc) {
4 String tag = "";
5 List<String> lines = new ArrayList<String>();
6
7 for (int i = 0; i < doc.children().size(); i++) {
8 summary(doc.child(i), lines);
9 }
10
11 for (int i = 0; i < lines.size(); i++) {
12 if (tag.length() > 0) tag += "\r\n";
13 tag += lines.get(i);
14 }
15
16 return tag;
17 }
18
19 private static void summary(Element ele, List<String> lines) {
20 if (ele.children().size() == 0 || allowedChildren(ele)) {
21 String[] tags = new String[] { "div", "p" };
22 for (int i = 0; i < tags.length; i++) {
23 if (ele.tagName().equalsIgnoreCase(tags[i])) {
24 String text = ele.text().trim();
25 if (text.length() > 0) {
26 if (text.endsWith(".") || text.endsWith("?")) {
27 lines.add(text);
28 }
29 }
30 }
31 }
32 } else {
33 for (int i = 0; i < ele.children().size(); i++) {
34 summary(ele.child(i), lines);
35 }
36 }
37 }
38
39 private static boolean allowedChildren(Element ele) {
40 String[] tags = new String[] { "a", "b", "i", "strong" };
41 for (int i = 0; i < ele.children().size(); i++) {
42 Element child = ele.child(i);
43 boolean found = false;
44 for (int j = 0; j < tags.length; j++) {
45 if (tags[j].equalsIgnoreCase(child.tagName())) {
46 found = true;
47 break;
48 }
49 }
50 if (!found) return false;
51 }
52 return true;
53 }
54
55}
public static class Summary {
     
    public static String extract(Document doc) {
        String tag = "";
        List<String> lines = new ArrayList<String>();
         
        for (int i = 0; i < doc.children().size(); i++) {
            summary(doc.child(i), lines);
        }

        for (int i = 0; i < lines.size(); i++) {
            if (tag.length() > 0) tag += "\r\n";
            tag += lines.get(i);
        }
         
        return tag;
    }
        
    private static void summary(Element ele, List<String> lines) {
        if (ele.children().size() == 0 || allowedChildren(ele)) {
            String[] tags = new String[] { "div", "p" };
            for (int i = 0; i < tags.length; i++) {
                if (ele.tagName().equalsIgnoreCase(tags[i])) {
                    String text = ele.text().trim();
                    if (text.length() > 0) {
                        if (text.endsWith(".") || text.endsWith("?")) {
                            lines.add(text);
                        }
                    }
                }
            }
        } else {
            for (int i = 0; i < ele.children().size(); i++) {
                summary(ele.child(i), lines);
            }
        }
    }
        
    private static boolean allowedChildren(Element ele) {
        String[] tags = new String[] { "a", "b", "i", "strong" };
        for (int i = 0; i < ele.children().size(); i++) {
            Element child = ele.child(i);
            boolean found = false;
            for (int j = 0; j < tags.length; j++) {
                if (tags[j].equalsIgnoreCase(child.tagName())) {
                    found = true;
                    break;
                }
            }
            if (!found) return false;
        }
        return true;
    }
     
}
Java jsoup

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Posted by at 02:02 0 comments
Labels:

Task tagged by [jsoup]

  1. Extract summary of web page
  2. Grab jobs from vWorker
  3. Grab jobs from Freelancer
  4. Grab jobs from oDesk
  5. Grab jobs from Stack Overflow Careers
  6. Extract Lotus Notes database icon
  7. Create javascript sandbox with jsoup support
  8. Grab vBulletin pages in logged-in mode
  9. Add JSON support to javascript sandbox
  10. Grab google search results
  11. Grab categories from Amazon aStores
  12. Grab products from Amazon aStores
  13. Grab categories from BestBuy
  14. Grab products from BestBuy
  15. Grab categories from Walmart
  16. Grab products from Walmart
  17. Grab categories from Newegg
  18. Grab products from Newegg
  19. Add Lucene support to javascript sandbox
  20. Add MySQL support to javascript sandbox
  21. Grab categories from HP Shopping
  22. Grab products from HP Shopping
  23. Grab video from YouTube
  24. Grab video from DailyMotion
  25. Grab book/journal from ScienceDirect
  26. Grab article from ScienceDirect
  27. Grab search results from Google
  28. Grab search results from Bing
  29. Grab search results from Yahoo
Posted by at 01:58 0 comments
Labels:

Parse simple math expression

Parse simple math expression
This task use java to parse simple math expression.
Parse simple math expression
  1. Create Formula class as following
  2. Call Formula.calculate() method as following
Call Formula.calculate() method
1Map<String, Object> data = new HashMap<String, Object>();
2data.put("a", 2);
3data.put("b", 3);
4String formula = "a - b * a";
5Object result = Formula.calculate(data, formula);
6if (result != null) {
7 logger.info(result.toString());
8} else {
9 logger.info("NULL");
10}
Map<String, Object> data = new HashMap<String, Object>();
data.put("a", 2);
data.put("b", 3);
String formula = "a - b * a";
Object result = Formula.calculate(data, formula);
if (result != null) {
    logger.info(result.toString());
} else {
    logger.info("NULL");
}
Formula class
1public static class Formula {
2
3 private Map<String, Object> data;
4 private String formula;
5
6 public Formula(Map<String, Object> data, String formula) {
7 this.data = data;
8 this.formula = formula;
9 }
10
11 public static Object calculate(Map<String, Object> data, String formula) {
12 return new Formula(data, formula).calculate();
13 }
14
15 public Object calculate() {
16 int pos = lastOperator(formula, new String[] { "+", "-" });
17 if (pos < 0) {
18 pos = lastOperator(formula, new String[] { "*", "/" });
19 if (pos < 0) {
20 return calculate(formula);
21 } else {
22 return calculate(formula.substring(0, pos).trim(), formula.charAt(pos) + "", formula.substring(pos + 1).trim());
23 }
24 } else {
25 return calculate(formula.substring(0, pos).trim(), formula.charAt(pos) + "", formula.substring(pos + 1).trim());
26 }
27 }
28
29 private Object calculate(String leftSide, String operator, String rightSide) {
30 Object valLeft = null;
31 Object valRight = null;
32 int pos = lastOperator(leftSide, new String[] { "+", "-" });
33 if (pos < 0) {
34 pos = lastOperator(leftSide, new String[] { "*", "/" });
35 if (pos < 0) {
36 valLeft = calculate(leftSide);
37 } else {
38 valLeft = calculate(leftSide.substring(0, pos).trim(), leftSide.charAt(pos) + "", leftSide.substring(pos + 1).trim());
39 }
40 } else {
41 valLeft = calculate(leftSide.substring(0, pos).trim(), leftSide.charAt(pos) + "", leftSide.substring(pos + 1).trim());
42 }
43 pos = lastOperator(rightSide, new String[] { "*", "/" });
44 if (pos < 0) {
45 valRight = calculate(rightSide);
46 } else {
47 valRight = calculate(rightSide.substring(0, pos).trim(), rightSide.charAt(pos) + "", rightSide.substring(pos + 1).trim());
48 }
49 return calculate(valLeft, operator, valRight);
50 }
51
52 private Object calculate(Object leftSide, String operator, Object rightSide) {
53 Object tag = null;
54 if (leftSide == null || rightSide == null) return null;
55 if (isNumber(leftSide) && isNumber(rightSide)) {
56 double valLeft = parseNumber(leftSide);
57 double valRight = parseNumber(rightSide);
58 tag = calculate(valLeft, operator, valRight);
59 } else if (isString(leftSide) || isString(rightSide)) {
60 if ("+".equals(operator)) {
61 tag = leftSide.toString() + rightSide.toString();
62 }
63 }
64 return tag;
65 }
66
67 private Object calculate(double leftSide, String operator, double rightSide) {
68 if ("+".equals(operator)) {
69 return leftSide + rightSide;
70 } else if ("-".equals(operator)) {
71 return leftSide - rightSide;
72 } else if ("*".equals(operator)) {
73 return leftSide * rightSide;
74 } else if ("/".equals(operator) && rightSide != 0) {
75 return leftSide / rightSide;
76 } else {
77 return null;
78 }
79 }
80
81 private double parseNumber(Object src) {
82 double tag = 0;
83 try {
84 tag = Double.parseDouble(src.toString());
85 } catch (Exception e) {
86 tag = 0;
87 }
88 return tag;
89 }
90
91 private boolean isString(Object src) {
92 String kind = src.getClass().getName();
93 if ("java.lang.String".equals(kind)) return true;
94 return false;
95 }
96
97 private boolean isNumber(Object src) {
98 if (src == null) return false;
99 String[] types = new String[] { "java.lang.Character", "java.lang.Byte", "java.lang.Short", "java.lang.Integer", "java.lang.Long", "java.lang.Float", "java.lang.Double" };
100 String kind = src.getClass().getName();
101 for (int i = 0; i < types.length; i++) {
102 if (types[i].equalsIgnoreCase(kind)) return true;
103 }
104 return false;
105 }
106
107 private Object calculate(String src) {
108 if (data.containsKey(src)) {
109 return data.get(src);
110 } else {
111 return null;
112 }
113 }
114
115 private int lastOperator(String src, String[] operators) {
116 int tag = -1;
117 for (int i = 0; i < operators.length; i++) {
118 int pos = src.lastIndexOf(operators[i]);
119 if (pos < 0) continue;
120 if (tag < 0) {
121 tag = pos;
122 } else {
123 if (pos > tag) {
124 tag = pos;
125 }
126 }
127 }
128 return tag;
129 }
130
131}
public static class Formula {

    private Map<String, Object> data;
    private String formula;

    public Formula(Map<String, Object> data, String formula) {
        this.data = data;
        this.formula = formula;
    }
     
    public static Object calculate(Map<String, Object> data, String formula) {
        return new Formula(data, formula).calculate();
    }
     
    public Object calculate() {
        int pos = lastOperator(formula, new String[] { "+", "-" });
        if (pos < 0) {
            pos = lastOperator(formula, new String[] { "*", "/" });
            if (pos < 0) {
                return calculate(formula);
            } else {
                return calculate(formula.substring(0, pos).trim(), formula.charAt(pos) + "", formula.substring(pos + 1).trim());
            }
        } else {
            return calculate(formula.substring(0, pos).trim(), formula.charAt(pos) + "", formula.substring(pos + 1).trim());
        }
    }
     
    private Object calculate(String leftSide, String operator, String rightSide) {
        Object valLeft = null;
        Object valRight = null;
        int pos = lastOperator(leftSide, new String[] { "+", "-" });
        if (pos < 0) {
            pos = lastOperator(leftSide, new String[] { "*", "/" });
            if (pos < 0) {
                valLeft = calculate(leftSide);
            } else {
                valLeft = calculate(leftSide.substring(0, pos).trim(), leftSide.charAt(pos) + "", leftSide.substring(pos + 1).trim());
            }
        } else {
            valLeft = calculate(leftSide.substring(0, pos).trim(), leftSide.charAt(pos) + "", leftSide.substring(pos + 1).trim());
        }
        pos = lastOperator(rightSide, new String[] { "*", "/" });
        if (pos < 0) {
            valRight = calculate(rightSide);
        } else {
            valRight = calculate(rightSide.substring(0, pos).trim(), rightSide.charAt(pos) + "", rightSide.substring(pos + 1).trim());
        }
        return calculate(valLeft, operator, valRight);
    }
     
    private Object calculate(Object leftSide, String operator, Object rightSide) {
        Object tag = null;
        if (leftSide == null || rightSide == null) return null;
        if (isNumber(leftSide) && isNumber(rightSide)) {
            double valLeft = parseNumber(leftSide);
            double valRight = parseNumber(rightSide);
            tag = calculate(valLeft, operator, valRight);
        } else if (isString(leftSide) || isString(rightSide)) {
            if ("+".equals(operator)) {
                tag = leftSide.toString() + rightSide.toString();
            }
        }
        return tag;
    }
     
    private Object calculate(double leftSide, String operator, double rightSide) {
        if ("+".equals(operator)) {
            return leftSide + rightSide;
        } else if ("-".equals(operator)) {
            return leftSide - rightSide;
        } else if ("*".equals(operator)) {
            return leftSide * rightSide;
        } else if ("/".equals(operator) && rightSide != 0) {
            return leftSide / rightSide;
        } else {
            return null;
        }
    }
     
    private double parseNumber(Object src) {
        double tag = 0;
        try {
            tag = Double.parseDouble(src.toString());
        } catch (Exception e) {
            tag = 0;
        }
        return tag;
    }
     
    private boolean isString(Object src) {
        String kind = src.getClass().getName();
        if ("java.lang.String".equals(kind)) return true;
        return false;
    }
     
    private boolean isNumber(Object src) {
        if (src == null) return false;
        String[] types = new String[] { "java.lang.Character", "java.lang.Byte", "java.lang.Short", "java.lang.Integer", "java.lang.Long", "java.lang.Float", "java.lang.Double" };
        String kind = src.getClass().getName();
        for (int i = 0; i < types.length; i++) {
            if (types[i].equalsIgnoreCase(kind)) return true;
        }
        return false;
    }
     
    private Object calculate(String src) {
        if (data.containsKey(src)) {
            return data.get(src);
        } else {
            return null;
        }
    }
     
    private int lastOperator(String src, String[] operators) {
        int tag = -1;
        for (int i = 0; i < operators.length; i++) {
            int pos = src.lastIndexOf(operators[i]);
            if (pos < 0) continue;
            if (tag < 0) {
                tag = pos;
            } else {
                if (pos > tag) {
                    tag = pos;
                }
            }
        }
        return tag;
    }
     
}
Java

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