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使用JSON-LIB可以極大的簡(jiǎn)化JAVA對(duì)象轉(zhuǎn)換成JSON對(duì)象所需進(jìn)行的操作,更可以避免人工操作生成JSON對(duì)象字符串時(shí)帶來(lái)的麻煩和誤操作：
使用JSON-LIB，首先要有幾個(gè)支持的包：
http://json-lib.sourceforge.net下載json-lib-1.1-jdk15.jar
commons-lang.jar、commons-logging.jar，commons-beanutils.jar  這些包可在tomcat/comon/lib下找到
EZMorph 下載地址http://ezmorph.sourceforge.net
morph-1.0.1 下載地址:http://morph.sourceforge.net

使用例子：

Java代碼  

1. import java.util.ArrayList;  
2. import java.util.HashMap;  
3. import java.util.List;  
4. import java.util.Map;  
5.   
6. import net.sf.json.JSONArray;  
7. import net.sf.json.JSONObject;  
8.   
9. public class JSONTest {  
10.     public static void main(String[] args) {     
11.         JSONTest j = new JSONTest();     
12.         j.ObjectList2json();     
13.     }      
14.      
15.     public void ObjectList2json(){  
16.         Map map = new HashMap();  
17.           
18.         List jlist = new ArrayList();  
19.         JSONTestBean bean1 = new JSONTestBean("zhangbo","123123");  
20.         JSONTestBean bean2 = new JSONTestBean("lisi","65489");  
21.         Props props = new Props("127.0.0.1","8008");  
22.           
23.         jlist.add(bean1);  
24.         jlist.add(bean2);  
25.           
26.         map.put("Props", props);  
27.         map.put("jsonObjectList", jlist);  
28.           
29.         JSONArray jsonArray = JSONArray.fromObject(map);     
30.         System.out.println(jsonArray);     
31.     }  
32.       
33.     public void arr2json() {     
34.         boolean[] boolArray = new boolean[] { true, false, true };     
35.         JSONArray jsonArray = JSONArray.fromObject(boolArray);     
36.         System.out.println(jsonArray);     
37.         // prints [true,false,true]     
38.     }     
39.      
40.     public void list2json() {     
41.         List list = new ArrayList();    
42.         list.add("first");     
43.         list.add("second");     
44.         JSONArray jsonArray = JSONArray.fromObject(list);     
45.         System.out.println(jsonArray);     
46.         // prints ["first","second"]     
47.     }     
48.      
49.     public void createJson() {     
50.         JSONArray jsonArray = JSONArray.fromObject("['json','is','easy']");     
51.         System.out.println(jsonArray);     
52.         // prints ["json","is","easy"]     
53.     }     
54.      
55.     public void map2json() {     
56.         Map map = new HashMap();  
57.         map.put("name", "json");     
58.         map.put("bool", Boolean.TRUE);     
59.         map.put("int", new Integer(1));     
60.         map.put("arr", new String[] { "a", "b" });     
61.         map.put("func", "function(i){ return this.arr[i]; }");     
62.      
63.         JSONObject json = JSONObject.fromObject(map);     
64.         System.out.println(json);     
65.         // prints     
66.         // ["name":"json","bool":true,"int":1,"arr":["a","b"],"func":function(i){     
67.         // return this.arr[i]; }]     
68.     }     
69.      
70.     public void bean2json() {     
71.         JSONObject jsonObject = JSONObject.fromObject(new JSONTestBean("zhangbo","234234"));     
72.         System.out.println(jsonObject);     
73.         /*   
74.          * prints    
75.          * {"func1":function(i){ return this.options[i];   
76.          * },"pojoId":1,"name":"json","func2":function(i){ return   
77.          * this.options[i]; }}   
78.          */     
79.     }     
80.      
81.     public void json2bean() {     
82.         String json = "{name=\"json2\",func1:true,pojoId:1,func2:function(a){ return a; },options:['1','2']}";     
83. //        JSONObject jb = JSONObject.fromString(json);     
84. //        JSONObject.toBean(jb, MyBean.class);     
85.         System.out.println();     
86.     }     
87. }  
88.   
89. 其它兩個(gè)測(cè)試實(shí)體Bean:  
90. public class JSONTestBean {  
91.   
92.     private String userName;  
93.   
94.     private String password;  
95.   
96.     public JSONTestBean() {  
97.   
98.     }  
99.   
100.     public JSONTestBean(String username, String password) {  
101.         this.userName = username;  
102.         this.password = password;  
103.     }  
104.   
105.     public String getPassword() {  
106.         return password;  
107.     }  
108.   
109.     public void setPassword(String password) {  
110.         this.password = password;  
111.     }  
112.   
113.     public String getUserName() {  
114.         return userName;  
115.     }  
116.   
117.     public void setUserName(String userName) {  
118.         this.userName = userName;  
119.     }  
120. }  
121.   
122. //===================================================  
123. public class Props {  
124.     private String ip;  
125.     private String port;  
126.   
127.     public Props() {  
128.     }  
129.   
130.     public Props(String ip, String port) {  
131.         this.ip = ip;  
132.         this.port = port;  
133.     }  
134.   
135.     public String getIp() {  
136.         return ip;  
137.     }  
138.   
139.     public void setIp(String ip) {  
140.         this.ip = ip;  
141.     }  
142.   
143.     public String getPort() {  
144.         return port;  
145.     }  
146.   
147.     public void setPort(String port) {  
148.         this.port = port;  
149.     }  
150.   
151. }  

import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class JSONTest {    public static void main(String[] args) {           JSONTest j = new JSONTest();           j.ObjectList2json();       }           public void ObjectList2json(){        Map map = new HashMap();                List jlist = new ArrayList();        JSONTestBean bean1 = new JSONTestBean("zhangbo","123123");        JSONTestBean bean2 = new JSONTestBean("lisi","65489");        Props props = new Props("127.0.0.1","8008");                jlist.add(bean1);        jlist.add(bean2);                map.put("Props", props);        map.put("jsonObjectList", jlist);                JSONArray jsonArray = JSONArray.fromObject(map);           System.out.println(jsonArray);       }        public void arr2json() {           boolean[] boolArray = new boolean[] { true, false, true };           JSONArray jsonArray = JSONArray.fromObject(boolArray);           System.out.println(jsonArray);           // prints [true,false,true]       }          public void list2json() {           List list = new ArrayList();          list.add("first");           list.add("second");           JSONArray jsonArray = JSONArray.fromObject(list);           System.out.println(jsonArray);           // prints ["first","second"]       }          public void createJson() {           JSONArray jsonArray = JSONArray.fromObject("['json','is','easy']");           System.out.println(jsonArray);           // prints ["json","is","easy"]       }          public void map2json() {           Map map = new HashMap();        map.put("name", "json");           map.put("bool", Boolean.TRUE);           map.put("int", new Integer(1));           map.put("arr", new String[] { "a", "b" });           map.put("func", "function(i){ return this.arr[i]; }");              JSONObject json = JSONObject.fromObject(map);           System.out.println(json);           // prints           // ["name":"json","bool":true,"int":1,"arr":["a","b"],"func":function(i){           // return this.arr[i]; }]       }          public void bean2json() {           JSONObject jsonObject = JSONObject.fromObject(new JSONTestBean("zhangbo","234234"));           System.out.println(jsonObject);           /*           * prints            * {"func1":function(i){ return this.options[i];           * },"pojoId":1,"name":"json","func2":function(i){ return           * this.options[i]; }}           */       }          public void json2bean() {           String json = "{name=\"json2\",func1:true,pojoId:1,func2:function(a){ return a; },options:['1','2']}";   //        JSONObject jb = JSONObject.fromString(json);   //        JSONObject.toBean(jb, MyBean.class);           System.out.println();       }   }其它兩個(gè)測(cè)試實(shí)體Bean:public class JSONTestBean {    private String userName;    private String password;    public JSONTestBean() {    }    public JSONTestBean(String username, String password) {        this.userName = username;        this.password = password;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }}//===================================================public class Props {    private String ip;    private String port;    public Props() {    }    public Props(String ip, String port) {        this.ip = ip;        this.port = port;    }    public String getIp() {        return ip;    }    public void setIp(String ip) {        this.ip = ip;    }    public String getPort() {        return port;    }    public void setPort(String port) {        this.port = port;    }}

 

使用起來(lái)很方便，有了JSON-LIB的支持，可以使開(kāi)發(fā)者輕松構(gòu)建起基于JSON的AJAX應(yīng)用程序

附加:關(guān)于使用JSON-LIB轉(zhuǎn)換帶有DATE類型的對(duì)象需要額外的一些設(shè)置

Java代碼  

1. JsonConfig cfg=new JsonConfig();  
2. cfg.registerJsonValueProcessor(java.util.Date.class, new JsonValueProcessorImpl());  
3. cfg.registerJsonValueProcessor(java.sql.Date.class, new JsonValueProcessorImpl());  
4. JSONObject obj = JSONObject.fromObject(info,cfg);  

JsonConfig cfg=new JsonConfig();cfg.registerJsonValueProcessor(java.util.Date.class, new JsonValueProcessorImpl());cfg.registerJsonValueProcessor(java.sql.Date.class, new JsonValueProcessorImpl());JSONObject obj = JSONObject.fromObject(info,cfg);

JsonValueProcessorImpl為實(shí)現(xiàn)了源代碼中的接口JsonValueProcessor

Java代碼  

1. import java.text.SimpleDateFormat;  
2. import java.util.Date;  
3.   
4. import net.sf.json.JsonConfig;  
5. import net.sf.json.processors.JsonValueProcessor;  
6.   
7. public class JsonValueProcessorImpl implements JsonValueProcessor{  
8.  private String format="yyyy-MM-dd";  
9.  public JsonValueProcessorImpl(){  
10.     
11.  }  
12.  public JsonValueProcessorImpl(String format){  
13.   this.format=format;  
14.  }  
15.  public Object processArrayValue(Object value, JsonConfig jsonConfig) {  
16.   String[] obj={};  
17.   if(value instanceof Date[]){  
18.    SimpleDateFormat sf=new SimpleDateFormat(format);  
19.    Date[] dates=(Date[])value;  
20.    obj =new String[dates.length];  
21.    for (int i = 0; i < dates.length; i++) {  
22.     obj[i]=sf.format(dates[i]);  
23.    }  
24.   }  
25.   return obj;  
26.  }  
27.   
28.  public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {  
29.   if(value instanceof Date){  
30.    String str=new SimpleDateFormat(format).format((Date)value);  
31.    return str;  
32.   }  
33.   return value.toString();  
34.  }  
35.   
36.  public String getFormat() {  
37.   return format;  
38.  }  
39.   
40.  public void setFormat(String format) {  
41.   this.format = format;  
42.  }  
43.    
44. }   

import java.text.SimpleDateFormat;import java.util.Date;import net.sf.json.JsonConfig;import net.sf.json.processors.JsonValueProcessor;public class JsonValueProcessorImpl implements JsonValueProcessor{ private String format="yyyy-MM-dd"; public JsonValueProcessorImpl(){   } public JsonValueProcessorImpl(String format){  this.format=format; } public Object processArrayValue(Object value, JsonConfig jsonConfig) {  String[] obj={};  if(value instanceof Date[]){   SimpleDateFormat sf=new SimpleDateFormat(format);   Date[] dates=(Date[])value;   obj =new String[dates.length];   for (int i = 0; i < dates.length; i++) {    obj[i]=sf.format(dates[i]);   }  }  return obj; } public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {  if(value instanceof Date){   String str=new SimpleDateFormat(format).format((Date)value);   return str;  }  return value.toString(); } public String getFormat() {  return format; } public void setFormat(String format) {  this.format = format; } } 

這也只是實(shí)現(xiàn)了將DATE類型轉(zhuǎn)換成yyyy-MM-dd的格式...測(cè)試一下吧!~~~