java 转json 报错处理机制 案例 .
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JSON-lib这个Java类包用于把bean,map和XML转换成JSON并能够把JSON转回成bean和DynaBean。 http://kingpingping.iteye.com/blog/1157771
报错处理机制 commons-beanutils-1.8.0.jar不加这个包 java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean commons-collections.jar 不加这个包 java.lang.NoClassDefFoundError: org/apache/commons/collections/map/ListOrderedMap commons-lang-2.4.jar不加这个包 java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException commons-logging-1.1.1.jar不加这个包 java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory ezmorph-1.0.4.jar不加这个包 java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher json-lib-2.3-jdk15.jar不加这个包 java.lang.NoClassDefFoundError: net/sf/json/JSONObject 我把这段代码拿到junit下测试 就报错了。java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException错误，查了下原因原来是少了3个包。因为我在使用json的时候只导入了json-lib-2.1.jar这个包 但是程序还需要这4个包： commons-beanutils-1.7.0.jar commons-collections-3.2.jar commons-lang-2.1.jar ezmorph-1.0.2.jar 导入之后就发现 OK了。 下载地址:http://json-lib.sourceforge.net/ 还要需要的第3方包: org.apache.commons(3.2以上版本) org.apache.oro net.sf.ezmorph(ezmorph-1.0.4.jar) nu.xom 1、List Java代码 boolean[] boolArray = new boolean[]{true,false,true}; JSONArray jsonArray1 = JSONArray.fromObject( boolArray ); System.out.println( jsonArray1 ); // prints [true,false,true] List list = new ArrayList(); list.add( "first" ); list.add( "second" ); JSONArray jsonArray2 = JSONArray.fromObject( list ); System.out.println( jsonArray2 ); // prints ["first","second"] JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" ); System.out.println( jsonArray3 ); // prints ["json","is","easy"] boolean[] boolArray = new boolean[]{true,false,true}; JSONArray jsonArray1 = JSONArray.fromObject( boolArray ); System.out.println( jsonArray1 ); // prints [true,false,true] List list = new ArrayList(); list.add( "first" ); list.add( "second" ); JSONArray jsonArray2 = JSONArray.fromObject( list ); System.out.println( jsonArray2 ); // prints ["first","second"] JSONArray jsonArray3 = JSONArray.fromObject( "['json','is','easy']" ); System.out.println( jsonArray3 ); // prints ["json","is","easy"] 2、Map Java代码 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 ); //{"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"name":"json","bool":true} 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 ); //{"func":function(i){ return this.arr[i]; },"arr":["a","b"],"int":1,"name":"json","bool":true} 3、BEAN Java代码 /** * Bean.java private String name = "json"; private int pojoId = 1; private char[] options = new char[]{'a','f'}; private String func1 = "function(i){ return this.options[i]; }"; private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];"); */ JSONObject jsonObject = JSONObject.fromObject( new JsonBean() ); System.out.println( jsonObject ); //{"func1":function(i){ return this.options[i]; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options[i]; }} /** * Bean.java private String name = "json"; private int pojoId = 1; private char[] options = new char[]{'a','f'}; private String func1 = "function(i){ return this.options[i]; }"; private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];"); */ JSONObject jsonObject = JSONObject.fromObject( new JsonBean() ); System.out.println( jsonObject ); //{"func1":function(i){ return this.options[i]; },"pojoId":1,"name":"json","options":["a","f"],"func2":function(i){ return this.options[i]; }} 4、BEANS Java代码 /** * private int row ; private int col ; private String value ; * */ List list = new ArrayList(); JsonBean2 jb1 = new JsonBean2(); jb1.setCol(1); jb1.setRow(1); jb1.setValue("xx"); JsonBean2 jb2 = new JsonBean2(); jb2.setCol(2); jb2.setRow(2); jb2.setValue(""); list.add(jb1); list.add(jb2); JSONArray ja = JSONArray.fromObject(list); System.out.println( ja.toString() ); //[{"value":"xx","row":1,"col":1},{"value":"","row":2,"col":2}] /** * private int row ; private int col ; private String value ; * */ List list = new ArrayList(); JsonBean2 jb1 = new JsonBean2(); jb1.setCol(1); jb1.setRow(1); jb1.setValue("xx"); JsonBean2 jb2 = new JsonBean2(); jb2.setCol(2); jb2.setRow(2); jb2.setValue(""); list.add(jb1); list.add(jb2); JSONArray ja = JSONArray.fromObject(list); System.out.println( ja.toString() ); //[{"value":"xx","row":1,"col":1},{"value":"","row":2,"col":2}] 5、String to bean Java代码 String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}"; JSONObject jsonObject = JSONObject.fromString(json); Object bean = JSONObject.toBean( jsonObject ); assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) ); assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) ); assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) ); assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) ); assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) ); List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) ); assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) ); String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}"; JSONObject jsonObject = JSONObject.fromString(json); Object bean = JSONObject.toBean( jsonObject ); assertEquals( jsonObject.get( "name" ), PropertyUtils.getProperty( bean, "name" ) ); assertEquals( jsonObject.get( "bool" ), PropertyUtils.getProperty( bean, "bool" ) ); assertEquals( jsonObject.get( "int" ), PropertyUtils.getProperty( bean, "int" ) ); assertEquals( jsonObject.get( "double" ), PropertyUtils.getProperty( bean, "double" ) ); assertEquals( jsonObject.get( "func" ), PropertyUtils.getProperty( bean, "func" ) ); List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) ); assertEquals( expected, (List) PropertyUtils.getProperty( bean, "array" ) ); Java代码 String json = "{\"value\":\"xx\",\"row\":1,\"col\":1}"; JSONObject jsonObject = JSONObject.fromString(json); JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class ); assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol()) ); assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) ); assertEquals( jsonObject.get( "value" ), bean.getValue() ); String json = "{\"value\":\"xx\",\"row\":1,\"col\":1}"; JSONObject jsonObject = JSONObject.fromString(json); JsonBean2 bean = (JsonBean2) JSONObject.toBean( jsonObject, JsonBean2.class ); assertEquals( jsonObject.get( "col" ),new Integer( bean.getCol()) ); assertEquals( jsonObject.get( "row" ), new Integer( bean.getRow() ) ); assertEquals( jsonObject.get( "value" ), bean.getValue() ); 6 json to xml 1) JSONObject json = new JSONObject( true ); String xml = XMLSerializer.write( json ); <o class="object" null="true"> 2) JSONObject json = JSONObject.fromObject("{\"name\":\"json\",\"bool\":true,\"int\":1}"); String xml = XMLSerializer.write( json ); <o class="object"> <name type="string">json</name> <bool type="boolean">true</bool> <int type="number">1</int> </o> <o class="object"> <name type="string">json</name> <bool type="boolean">true</bool> <int type="number">1</int> </o> 3) JSONArray json = JSONArray.fromObject("[1,2,3]"); String xml = XMLSerializer.write( json ); <a class="array"> <e type="number">1</e> <e type="number">2</e> <e type="number">3</e> </a> 7 、xml to json <a class="array"> <e type="function" params="i,j"> return matrix[i][j]; </e> </a> <a class="array"> <e type="function" params="i,j"> return matrix[i][j]; </e> </a> JSONArray json = (JSONArray) XMLSerializer.read( xml ); System.out.println( json ); // prints [function(i,j){ return matrix[i][j]; }] 在Java中加上这几个包 实例： import java.io.IOException; import java.util.ArrayList; import java.sql.Date; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import aa.JsonBean2; public class main extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List list = new ArrayList(); JsonBean2 jb1 = new JsonBean2(); jb1.setA(1); jb1.setB("丁龙飞"); System.out.println("*****123"); Date c=new Date(100,9,10); String s=c.toString(); System.out.println(s+"33333"); jb1.setC(s); JsonBean2 jb2 = new JsonBean2(); jb2.setA(1); jb2.setB("b"); jb2.setC(s); list.add(jb1); list.add(jb2); JSONObject obj= JSONObject.fromObject(jb1); System.out.println(obj.toString()+"*****123"); JSONArray ja = JSONArray.fromObject(list); System.out.println(ja.toString()+"-------------"); System.out.println("asdfasdf"); // List list=new ArrayList(); String a="var a=[[1,{text:'ext'},{text:'q'},1,'132','321','2008-01-01 12:01:01'],[2,{text:'ext'},{text:'w'},2,'132','321','2008-01-01 12:01:01']]"; response.getWriter().print(a); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } 转载地址：http://yhjab.baihongyu.com/