gson java对象与json转换(实例代码说明及教程)

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java对象转json

    public class MsgInfo2 {          private String message;           private String flag;          public String getMessage() {              return message;          }          public void setMessage(String message) {              this.message = message;          }          public String getFlag() {              return flag;          }          public void setFlag(String flag) {              this.flag = flag;          }       }      public class Test1 {          public static void main(String[] args) {              MsgInfo2 m2 = new MsgInfo2();              m2.setFlag("00");              m2.setMessage("message");              tojson(m2);              String json = "{'message':'message1','flag':'00'}";              toObject(json);          }          public static void tojson(MsgInfo2 m) {              // 将对象编译成json              Gson gson = new Gson();              String result = gson.toJson(m);              System.out.println(result);              // 输出：{"message":"message","flag":"00"}          }          public static void toObject(String m) {              // 将json编译成对象              Gson gson = new Gson();              MsgInfo2 msg = gson.fromJson(m, MsgInfo2.class);              System.out.println(msg.getFlag());//输出:00              System.out.println(msg.getMessage());//输出：message1          }      }

json转java对象

json的结构如下：{      "org":     {          "orgId": "orgId",          "orgName": "orgName"      },      "biz":     [                  {              "appcode": 55,              "subscode": "subscode0"          },                  {              "appcode": 66,              "subscode": "subscode1"          }      ]  }

    public class ComOpen {          private Org org;          private List<BizObject> biz;          public Org getOrg() {              return org;          }          public void setOrg(Org org) {              this.org = org;          }          public List<BizObject> getBiz() {              return biz;          }          public void setBiz(List<BizObject> biz) {              this.biz = biz;          }      }      public class Org {          private String orgId;          private String orgName;          public String getOrgId() {              return orgId;          }          public void setOrgId(String orgId) {              this.orgId = orgId;          }          public String getOrgName() {              return orgName;          }          public void setOrgName(String orgName) {              this.orgName = orgName;          }      }      public class BizObject {          private int appcode;          private String subscode;          public String getSubscode() {              return subscode;          }          public void setSubscode(String subscode) {              this.subscode = subscode;          }          public int getAppcode() {              return appcode;          }          public void setAppcode(int appcode) {              this.appcode = appcode;          }      }      /**      * 测试java对象和json转换      *      * @author yangliang      * @version 1.0      * @created 2011-10-11 下午03:14:04      * @history       * @see      */      public class Test2 {          public static void main(String[] args) {              toJson();              toObject();          }          public static void toJson(){              ComOpen como = new ComOpen();              Org org = new Org();              org.setOrgId("orgId");              org.setOrgName("orgName");              como.setOrg(org);              List<BizObject> biz = new ArrayList<BizObject>();              BizObject bizObject = new BizObject();               bizObject.setAppcode(55);              bizObject.setSubscode("subscode0");              BizObject bizObject1 = new BizObject();               bizObject1.setAppcode(66);              bizObject1.setSubscode("subscode1");              biz.add(bizObject);              biz.add(bizObject1);              como.setBiz(biz);              Gson gson=new GsonBuilder().create();              String result = gson.toJson(como);              System.out.println(result);              //输出{"org":{"orgId":"orgId","orgName":"orgName"},"biz":接下行              //[{"appcode":55,"subscode":"subscode0"},{"appcode":66,"subscode":"subscode1"}]}          }          public static void toObject(){              String json = "{'org':{'orgId':'orgId','orgName':'orgName'},'biz':" +               "[{'appcode':55,'subscode':'subscode0'},{'appcode':66,'subscode':'subscode1'}]}";              Gson gson=new Gson();              ComOpen  m3 = gson.fromJson(json, ComOpen.class);              System.out.println(m3.getBiz().size());//2              System.out.println("orgId："+m3.getOrg().getOrgId());//orgId：orgId              System.out.println("appcode："+ m3.getBiz().get(0).getAppcode());//appcode：55          }      }

Gson使用中遇到的Date格式问题：
http://rednaxelafx.iteye.com/blog/788306

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