ExtJS写的小系统，有源码，献给刚入门的朋友。

http://www.javaeye.com/topic/308362
接到任务，要写一个项目协作系统，任务不急，嘿嘿，用extjs试试看
这个系统是部门间用来扯皮用的，md又被当枪头了
自学了1个礼拜，就开始操刀了,代码很简单，模块化,希望对学习extjs的朋友有帮助，也帮俺的blog增加点人气(这样说话，不会扣分吧 ) 嘿嘿 。

献上源码，供大家参考

json格式化很方便，把取出来的数据，传给json格式化的类，就可以了。

这个类是处理sql语句，返回数据，和格式化json

Java代码

1. package com.soa.userbean;  
2.   
3. import java.sql.Connection;  
4. import java.sql.ResultSet;  
5. import java.sql.ResultSetMetaData;  
6. import java.sql.SQLException;  
7. import java.sql.Statement;  
8. import java.util.ArrayList;  
9. import java.util.HashMap;  
10. import java.util.Iterator;  
11. import java.util.Map;  
12. import java.util.Set;  
13.   
14. import javax.naming.Context;  
15. import javax.naming.InitialContext;  
16. import javax.sql.DataSource;  
17.   
18. import org.apache.log4j.Logger;  
19.   
20. /**
21. * @author Julycn
22. *
23. */  
24. public class InitDB {  
25.       Connection conn=null;  
26.       Statement stmt=null;  
27.       ResultSet rs=null;  
28.       ResultSetMetaData rsmd=null;  
29.      static Logger logger=Logger.getLogger(InitDB.class);  
30.       
31.     //初始化数据库连接  
32.     public static Connection InitDB(String jndiName) {  
33.          Connection conn=null;  
34.         try{  
35.          Context initContext=(Context) new InitialContext().lookup("java:/comp/env");  
36.          DataSource ds=(DataSource) initContext.lookup(jndiName);  
37.          conn=ds.getConnection();  
38.          }catch(Exception e){  
39.              logger.error("链接数据库失败："+e);  
40.          }  
41.         return conn;  
42.      }  
43.       
44.   
45.     //直接执行sql，用于更新，删除，添加  
46.     public boolean execute(String sql,String jndiName){  
47.           
48.          conn=InitDB.InitDB(jndiName);  
49.         try{  
50.             if(conn!=null){  
51.                  stmt=conn.createStatement();  
52.                  stmt.execute(sql);  
53.                   
54.                 return true;  
55.              }  
56.          }catch(Exception e){  
57.              logger.error("操作数据库失败："+e);  
58.          }finally{  
59.             try {  
60.                  stmt.close();  
61.                  conn.close();  
62.              } catch (SQLException e) {  
63.                  logger.error("关闭数据库失败："+e);  
64.              }  
65.          }  
66.         return false;  
67.      }  
68.       
69.       
70.     //获取记录数  
71.     public int findCount(String sql,String jndiName){  
72.          conn=InitDB.InitDB(jndiName);  
73.         int rowCount=0;  
74.         try {  
75.              stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);  
76.              rs=stmt.executeQuery(sql);  
77.              rs.last();  
78.              rowCount=rs.getRow();  
79.          } catch (SQLException e) {  
80.              e.printStackTrace();  
81.          }finally{  
82.             try {  
83.                  rs.close();  
84.                  stmt.close();  
85.                  conn.close();  
86.              } catch (SQLException e) {  
87.                  e.printStackTrace();  
88.              }  
89.          }  
90.         return rowCount;  
91.      }  
92.       
93.     //通过sql语句获取记录数,返回List  
94.     public ArrayList<Object> findBySql(String sql,String jndiName){  
95.           
96.          ArrayList<Object> list=new ArrayList<Object>();  
97.           
98.         try{  
99.              conn=InitDB.InitDB(jndiName);  
100.              stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);  
101.              rs=stmt.executeQuery(sql);  
102.              rsmd=rs.getMetaData();  
103.               
104.              String columnName="";  
105.              Object columnValue=null;  
106.   
107.             while(rs.next()){  
108.                  String array="";  
109.                  array+="{";  
110.                 for(int j=1;j<=rsmd.getColumnCount();j++){  
111.                      columnName=rsmd.getColumnName(j);  
112.                      columnValue=rs.getObject(columnName);  
113.                      array+="\""+columnName+"\"";  
114.                      array+=":";  
115.                      array+="\""+columnValue+"\"";  
116.                     if(j<rsmd.getColumnCount()){  
117.                          array+=",";  
118.                      }else{  
119.                          array+="";  
120.                      }  
121.                  }  
122.                  array+="}";  
123.                   
124.                  list.add(array);  
125.              }  
126.               
127.          }catch(Exception e){  
128.              e.printStackTrace();  
129.          }finally{  
130.             try {  
131.                  rs.close();  
132.                  stmt.close();  
133.                  conn.close();  
134.              } catch (SQLException e) {  
135.                  e.printStackTrace();  
136.              }  
137.          }  
138.         return list;  
139.      }  
140.       
141.     //把数据集处理成Ext可以接受的格式  
142.     public String toExtJson(String table,String sqlContent,int start,int limit,Object cons,String jndiName){  
143.          String sql=generateSql(table,sqlContent, cons);  
144.          System.out.println(sql);  
145.         int totalNum=findCount(sql, jndiName);  
146.          ArrayList<Object> list=findBySql(sql+" LIMIT "+limit+" OFFSET "+start, jndiName);  
147.         int resultNum=list.size();  
148.          String str="";  
149.          str+="";  
150.          str+="{";  
151.          str+="'totalCount':'"+totalNum+"',";  
152.          str+="'rows':";  
153.          str+="[";  
154.         for(int i=0;i<resultNum;i++){  
155.              str+="";  
156.              str+=list.get(i);  
157.             if(i<resultNum-1){  
158.                  str+=",";                 
159.              }else{  
160.                  str+="";  
161.              }  
162.          }  
163.          str+="]";  
164.          str+="}";  
165.         return str;  
166.      }  
167.       
168.       
169.     // 通过条件生存sql语句  
170.     @SuppressWarnings("unchecked")  
171.     public String generateSql(String table, String sqlContent,Object cons) {  
172.          String sql = "";  
173.         if(sqlContent==null){  
174.              sqlContent="*";  
175.          }  
176.          sql = "select "+sqlContent+" from " + table;  
177.          HashMap hashMap=null;  
178.         if (cons != null) {  
179.             if(cons instanceof HashMap){  
180.                  hashMap=(HashMap) cons;  
181.                  Set set=hashMap.entrySet();  
182.                  Iterator it=set.iterator();  
183.                 int k=0;  
184.                 while(it.hasNext()){  
185.                      Map.Entry me=(Map.Entry) it.next();  
186.                     if(k==0){  
187.                          sql+=" where ";  
188.                          sql+=me.getKey();  
189.                          sql+="=";  
190.                          sql+=me.getValue();  
191.                      }else{  
192.                          sql+=" and ";  
193.                          sql+=me.getKey();  
194.                          sql+="=";  
195.                          sql+=me.getValue();  
196.                      }  
197.                      k++;                      
198.                  }  
199.              }else{  
200.                  sql+=" where "+cons;  
201.              }  
202.          }  
203.   
204.         return sql;  
205.   
206.      }  
207. }  

package com.soa.userbean; import java.sql.Connection; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Set; import javax.naming.Context; import javax.naming.InitialContext; import javax.sql.DataSource; import org.apache.log4j.Logger; /** * @author Julycn * */ public class InitDB { Connection conn=null; Statement stmt=null; ResultSet rs=null; ResultSetMetaData rsmd=null; static Logger logger=Logger.getLogger(InitDB.class); //初始化数据库连接 public static Connection InitDB(String jndiName) { Connection conn=null; try{ Context initContext=(Context) new InitialContext().lookup("java:/comp/env"); DataSource ds=(DataSource) initContext.lookup(jndiName); conn=ds.getConnection(); }catch(Exception e){ logger.error("链接数据库失败："+e); } return conn; } //直接执行sql，用于更新，删除，添加 public boolean execute(String sql,String jndiName){ conn=InitDB.InitDB(jndiName); try{ if(conn!=null){ stmt=conn.createStatement(); stmt.execute(sql); return true; } }catch(Exception e){ logger.error("操作数据库失败："+e); }finally{ try { stmt.close(); conn.close(); } catch (SQLException e) { logger.error("关闭数据库失败："+e); } } return false; } //获取记录数 public int findCount(String sql,String jndiName){ conn=InitDB.InitDB(jndiName); int rowCount=0; try { stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); rs=stmt.executeQuery(sql); rs.last(); rowCount=rs.getRow(); } catch (SQLException e) { e.printStackTrace(); }finally{ try { rs.close(); stmt.close(); conn.close(); } catch (SQLException e) { e.printStackTrace(); } } return rowCount; } //通过sql语句获取记录数,返回List public ArrayList<Object> findBySql(String sql,String jndiName){ ArrayList<Object> list=new ArrayList<Object>(); try{ conn=InitDB.InitDB(jndiName); stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); rs=stmt.executeQuery(sql); rsmd=rs.getMetaData(); String columnName=""; Object columnValue=null; while(rs.next()){ String array=""; array+="{"; for(int j=1;j<=rsmd.getColumnCount();j++){ columnName=rsmd.getColumnName(j); columnValue=rs.getObject(columnName); array+="\""+columnName+"\""; array+=":"; array+="\""+columnValue+"\""; if(j<rsmd.getColumnCount()){ array+=","; }else{ array+=""; } } array+="}"; list.add(array); } }catch(Exception e){ e.printStackTrace(); }finally{ try { rs.close(); stmt.close(); conn.close(); } catch (SQLException e) { e.printStackTrace(); } } return list; } //把数据集处理成Ext可以接受的格式 public String toExtJson(String table,String sqlContent,int start,int limit,Object cons,String jndiName){ String sql=generateSql(table,sqlContent, cons); System.out.println(sql); int totalNum=findCount(sql, jndiName); ArrayList<Object> list=findBySql(sql+" LIMIT "+limit+" OFFSET "+start, jndiName); int resultNum=list.size(); String str=""; str+=""; str+="{"; str+="'totalCount':'"+totalNum+"',"; str+="'rows':"; str+="["; for(int i=0;i<resultNum;i++){ str+=""; str+=list.get(i); if(i<resultNum-1){ str+=","; }else{ str+=""; } } str+="]"; str+="}"; return str; } // 通过条件生存sql语句 @SuppressWarnings("unchecked") public String generateSql(String table, String sqlContent,Object cons) { String sql = ""; if(sqlContent==null){ sqlContent="*"; } sql = "select "+sqlContent+" from " + table; HashMap hashMap=null; if (cons != null) { if(cons instanceof HashMap){ hashMap=(HashMap) cons; Set set=hashMap.entrySet(); Iterator it=set.iterator(); int k=0; while(it.hasNext()){ Map.Entry me=(Map.Entry) it.next(); if(k==0){ sql+=" where "; sql+=me.getKey(); sql+="="; sql+=me.getValue(); }else{ sql+=" and "; sql+=me.getKey(); sql+="="; sql+=me.getValue(); } k++; } }else{ sql+=" where "+cons; } } return sql; } }

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