JSON 实例

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一、Java Action关键代码一：

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String jsonStr = JsonTool.list2Json(list);response.setContentType("text/html; charset=GBK");response.getWriter().write(jsonStr);return null;

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二、JsonTool.java

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package com.comba.omc.web.tool;import java.sql.Timestamp;import java.util.List;import java.util.Map;import java.util.Set;public class JsonTool {public static String string2Json(String s) {     StringBuilder sb = new StringBuilder(s.length()+20);     sb.append('\"');     for (int i=0; i<s.length(); i++) {         char c = s.charAt(i);         switch (c) {         case '\"':             sb.append("\\\"");             break;         case '\\':             sb.append("\\\\");             break;         case '/':             sb.append("\\/");             break;         case '\b':             sb.append("\\b");             break;         case '\f':             sb.append("\\f");             break;         case '\n':             sb.append("\\n");             break;         case '\r':             sb.append("\\r");             break;         case '\t':             sb.append("\\t");             break;         default:             sb.append(c);         }     }     sb.append('\"');     return sb.toString();  }public static String map2Json(Map<String, Object> map) {     if (map.isEmpty())         return "{}";     StringBuilder sb = new StringBuilder(map.size() << 4);     sb.append('{');     Set<String> keys = map.keySet();     for (String key : keys) {         Object value = map.get(key);         sb.append('\"');         sb.append(key);         sb.append('\"');         sb.append(':');         sb.append(toJson(value));         sb.append(',');     }     // 将最后的 ',' 变为 '}':     sb.setCharAt(sb.length()-1, '}');     return sb.toString(); } public  static String array2Json(Object[] array) {     if (array.length==0)         return "[]";     StringBuilder sb = new StringBuilder(array.length << 4);     sb.append('[');     for (Object o : array) {         sb.append(toJson(o));         sb.append(',');     }     // 将最后添加的 ',' 变为 ']':     sb.setCharAt(sb.length()-1, ']');     return sb.toString(); } public  static String list2Json(List list) {     if (list.size()==0)         return "[]";     StringBuilder sb = new StringBuilder(list.size() << 4);     sb.append('[');     for (Object o : list) {         sb.append(toJson(o));         sb.append(',');     }     // 将最后添加的 ',' 变为 ']':     sb.setCharAt(sb.length()-1, ']');     return sb.toString(); }public static String number2Json(Number number) { return number.toString(); } public static String boolean2Json(Boolean bool) { return bool.toString(); }public static String timestamp2Json(Timestamp time) { return "\"" + time.toString() + "\""; }public static String toJson(Object o) { if (o==null)     return "null"; if (o instanceof String)     return string2Json((String)o); if (o instanceof Boolean)     return boolean2Json((Boolean)o); if (o instanceof Number)     return number2Json((Number)o); if (o instanceof Map)     return map2Json((Map<String, Object>)o); if (o instanceof Object[])     return array2Json((Object[])o); if (o instanceof Timestamp) {return timestamp2Json((Timestamp) o);}throw new RuntimeException("Unsupported type: " + o.getClass().getName()); } public static void main(String[] args) {String s = "sssssssss";System.out.print(string2Json(s));Timestamp time = new Timestamp(System.currentTimeMillis());System.out.println(timestamp2Json(time));}}

三、js文件关键代码：

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$.post("searchNeUpPopAction.do",{oper :"region",cityIds :cityIds,subType :type},function(data) {var $div = $("#regionDiv");var html = "<table><tr><td><input type=\"checkbox\" name=\"regionCheckBox\" onclick=\"selectRegion(1,'"+ type+ "');\" value=\"0\" title=\"未知区域\">未知区域</td></tr>";var jsonObj = eval("(" + data + ")");for ( var i = 0; i < jsonObj.length; i++) {html += "<tr><td><input type=\"checkbox\" name=\"regionCheckBox\" onclick=\"selectRegion(1,'"+ type+ "');\" value=\""+ jsonObj[i].id+ "\">" + jsonObj[i].name + "</td></tr>";}});