生成 JSON 字符串代码,Java代码库,德仔网

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【Java】生成 JSON 字符串
作者: / 发布于2011/1/14/ 595
<div><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.ArrayList;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Iterator;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.LinkedHashMap;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.List;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Map;

</span><span style="color: #008000">/**</span><span style="color: #008000">
* JSON utility class
*
* </span><span style="color: #808080">@since</span><span style="color: #008000"> 2008-04-21
</span><span style="color: #008000">*/</span><span style="color: #000000">
</span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> Json {

 </span><span style="color: #008000">//</span><span style="color: #008000"> test</span><span style="color: #008000">
</span><span style="color: #000000"> </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> main(String[] args) {
 Json json1 </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> Json();
 json1.add(</span><span style="color: #000000">"</span><span style="color: #000000">totalCount</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">2</span><span style="color: #000000">);
 json1.add(</span><span style="color: #000000">"</span><span style="color: #000000">isTest</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #0000ff">true</span><span style="color: #000000">);
 
 Json json_a </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> Json();
 json_a.add(</span><span style="color: #000000">"</span><span style="color: #000000">menuid</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">1</span><span style="color: #000000">);
 json_a.add(</span><span style="color: #000000">"</span><span style="color: #000000">menuname</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">testmenu</span><span style="color: #000000">"</span><span style="color: #000000">);
 json1.add(</span><span style="color: #000000">"</span><span style="color: #000000">topics</span><span style="color: #000000">"</span><span style="color: #000000">, json_a);
 
 Json json_b </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> Json();
 json_b.add(</span><span style="color: #000000">"</span><span style="color: #000000">menuid</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">2</span><span style="color: #000000">);
 json_b.add(</span><span style="color: #000000">"</span><span style="color: #000000">menuname</span><span style="color: #000000">"</span><span style="color: #000000">, </span><span style="color: #000000">"</span><span style="color: #000000">testmenu</span><span style="color: #000000">"</span><span style="color: #000000">);
 json1.add(</span><span style="color: #000000">"</span><span style="color: #000000">topics</span><span style="color: #000000">"</span><span style="color: #000000">, json_b);
 System.out.println(json1.toString());
 }

 </span><span style="color: #0000ff">private</span><span style="color: #000000"> Map map </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> LinkedHashMap();

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 添加一个 JSON 属性，值为一个字符串，重复添加时产生数组<p/>
 * 
 * add("name", "value");<br/>
 * 添加一个字符串，产生的 JSON 如：{"name":"value"}<p/>
 * 
 * add("name", "value1");<br/>
 * add("name", "value2");<br/>
 * 添加两个同属性的字符串，产生的 JSON 如：{"name":["value1", "value2"]}<p/>
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> key JSON 属性名
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str 字符串格式的属性值
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> add(String key, String value) {
 addElement(key, value);
 }
 
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> add(String key, </span><span style="color: #0000ff">int</span><span style="color: #000000"> num) {
 addElement(key, </span><span style="color: #0000ff">new</span><span style="color: #000000"> Integer(num));
 }
 
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> add(String key, </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> b) {
 addElement(key, </span><span style="color: #0000ff">new</span><span style="color: #000000"> Boolean(b));
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * 添加一个 JSON 属性，值为一个 JSON，重复添加时产生 JSON 数组<p/>
 * 
 * Json json1 = new Json();<br/>
 * json1.add("name1", "value1");<br/>
 * json1.add("name2", "value2");<br/>
 * Json json = new Json();<br/>
 * json.add("message", json1);<br/>
 * 添加一个 JSON，产生的 JSON 如：{"message":{"name1":"value1", "name2":"value2"}}<p/>
 * 
 * Json json1 = new Json();<br/>
 * json1.add("name1", "value1");<br/>
 * json1.add("name2", "value2");<br/>
 * Json json2 = new Json();<br/>
 * json2.add("name1", "value3");<br/>
 * json2.add("name2", "value4");<br/>
 * Json json = new Json();<br/>
 * json.add("message", json1);<br/>
 * json.add("message", json2);<br/>
 * 添加两个同属性的 JSON，产生的 JSON 如：{"message":[{"name1":"value1", "name2":"value2"}, {"name1":"value3", "name2":"value4"}]}<p/>
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> key JSON 属性名
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> json JSON 格式的属性值
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> add(String key, Json json) {
 addElement(key, json);
 }

 </span><span style="color: #0000ff">public</span><span style="color: #000000"> String toString() {
 StringBuilder sb </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> StringBuilder();
 sb.append(</span><span style="color: #000000">"</span><span style="color: #000000">{</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">int</span><span style="color: #000000"> k </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">;
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (Iterator i </span><span style="color: #000000">=</span><span style="color: #000000"> map.keySet().iterator(); i.hasNext();) {
 String key </span><span style="color: #000000">=</span><span style="color: #000000"> (String)(i.next());
 Object obj </span><span style="color: #000000">=</span><span style="color: #000000"> map.get(key);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (k </span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 sb.append(</span><span style="color: #000000">"</span><span style="color: #000000">,</span><span style="color: #000000">"</span><span style="color: #000000">);
 }
 appendKey(sb, key);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (obj </span><span style="color: #0000ff">instanceof</span><span style="color: #000000"> String) {
 appendString(sb, (String)obj);
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (obj </span><span style="color: #0000ff">instanceof</span><span style="color: #000000"> List) {
 appendList(sb, (List)obj);
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (obj </span><span style="color: #0000ff">instanceof</span><span style="color: #000000"> Json) {
 appendJson(sb, (Json)obj);
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> {
 appendOther(sb, obj);
 }
 k</span><span style="color: #000000">++</span><span style="color: #000000">;
 }
 sb.append(</span><span style="color: #000000">"</span><span style="color: #000000">}</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> sb.toString();
 }

 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> addElement(String key, Object obj) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (</span><span style="color: #000000">!</span><span style="color: #000000">map.containsKey(key)) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000">(obj </span><span style="color: #0000ff">instanceof</span><span style="color: #000000"> Json) {
 List list </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> ArrayList();
 list.add(obj);
 map.put(key, list);
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> {
 map.put(key, obj);
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000">;
 }

 Object o </span><span style="color: #000000">=</span><span style="color: #000000"> map.remove(key);

 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (o </span><span style="color: #0000ff">instanceof</span><span style="color: #000000"> List) {
 ((List)o).add(obj);
 map.put(key, o);
 </span><span style="color: #0000ff">return</span><span style="color: #000000">;
 }

 </span><span style="color: #008000">//</span><span style="color: #008000"> o is a String</span><span style="color: #008000">
</span><span style="color: #000000"> List list </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> ArrayList();
 list.add(o);
 list.add(obj);
 map.put(key, list);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * Append JSON property name
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> sb
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> key
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> appendKey(StringBuilder sb, String key) {
 sb.append(</span><span style="color: #000000">"</span><span style="color: #000000">\"</span><span style="color: #000000">"</span><span style="color: #000000">).append(key).append(</span><span style="color: #000000">"</span><span style="color: #000000">\":</span><span style="color: #000000">"</span><span style="color: #000000">);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * Append JSON property value that is a String
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> sb
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> str
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> appendString(StringBuilder sb, String str) {
 sb.append(</span><span style="color: #000000">"</span><span style="color: #000000">\"</span><span style="color: #000000">"</span><span style="color: #000000">).append(str).append(</span><span style="color: #000000">"</span><span style="color: #000000">\"</span><span style="color: #000000">"</span><span style="color: #000000">);
 }
 
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * Append JSON property value that is a Integer
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> sb
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> num
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> appendOther(StringBuilder sb, Object obj) {
 sb.append(obj);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * Append JSON property value that is a List
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> sb
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> list
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> appendList(StringBuilder sb, List list) {
 sb.append(</span><span style="color: #000000">"</span><span style="color: #000000">[</span><span style="color: #000000">"</span><span style="color: #000000">);
 </span><span style="color: #0000ff">for</span><span style="color: #000000"> (</span><span style="color: #0000ff">int</span><span style="color: #000000"> j </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">, m </span><span style="color: #000000">=</span><span style="color: #000000"> list.size(); j </span><span style="color: #000000"><</span><span style="color: #000000"> m; j</span><span style="color: #000000">++</span><span style="color: #000000">) {
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (j </span><span style="color: #000000">></span><span style="color: #000000"> </span><span style="color: #000000">0</span><span style="color: #000000">) {
 sb.append(</span><span style="color: #000000">"</span><span style="color: #000000">,</span><span style="color: #000000">"</span><span style="color: #000000">);
 }
 Object obj </span><span style="color: #000000">=</span><span style="color: #000000"> list.get(j);
 </span><span style="color: #0000ff">if</span><span style="color: #000000"> (obj </span><span style="color: #0000ff">instanceof</span><span style="color: #000000"> String) {
 appendString(sb, (String)obj);
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> </span><span style="color: #0000ff">if</span><span style="color: #000000"> (obj </span><span style="color: #0000ff">instanceof</span><span style="color: #000000"> Json) {
 appendJson(sb, (Json)obj);
 } </span><span style="color: #0000ff">else</span><span style="color: #000000"> {
 appendOther(sb, obj);
 }
 }
 sb.append(</span><span style="color: #000000">"</span><span style="color: #000000">]</span><span style="color: #000000">"</span><span style="color: #000000">);
 }

 </span><span style="color: #008000">/**</span><span style="color: #008000">
 * Append JSON property value that is a JSON
 * 
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> sb
 * </span><span style="color: #808080">@param</span><span style="color: #008000"> json
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">private</span><span style="color: #000000"> </span><span style="color: #0000ff">void</span><span style="color: #000000"> appendJson(StringBuilder sb, Json json) {
 sb.append(json.toString());
 }
}</span>
</div>
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