jackson json转对象 json转集合 对大小写支持

     @JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, isGetterVisibility = Visibility.NONE)
     public static class XnServiceGetUserTest {
         @NotEmpty(message = "票据凭证不能为空")
         private String Token;

         @NotEmpty(message = "用户号不能为空")
         private String PERNR;

         @NotEmpty(message = "操作类型不能为空")
         private String OPTYPE = "QRY";

         public String getToken() {
             return Token;
         }

         public void setToken(String token) {
             Token = token;
         }

         public String getPERNR() {
             return PERNR;
         }

         public void setPERNR(String pERNR) {
             PERNR = pERNR;
         }

         public String getOPTYPE() {
             return OPTYPE;
         }

         public void setOPTYPE(String oPTYPE) {
             OPTYPE = oPTYPE;
         }

     }

-----------json转对象和对象转json

     public static void main(String[] args) throws Exception {
         String json = "{\"OPTYPE\":\"QRY\",\"Token\":\"cRQENwe3AYNpTlz7e0dxag==\",\"PERNR\":\"aaa\"}";
         ObjectMapper mapper = new ObjectMapper();
 　　　　 //json转对象
         XnServiceGetUserTest xnServiceGetUserTest = mapper.readValue(json, XnServiceGetUserTest.class);

         System.out.println(xnServiceGetUserTest.OPTYPE);
         System.out.println(xnServiceGetUserTest.PERNR);
         System.out.println(xnServiceGetUserTest.Token);
 　　　　 //对象转json
         System.out.println(mapper.writeValueAsString(xnServiceGetUserTest));

     }

-------------json集合 转对象

     public static void main(String[] args) throws Exception {

         Aaw aaw = new Aaw();
         List a = new ArrayList();
         a.add(aaw);
         aaw.setWocao("xxx");
         a.add(aaw);

         System.out.println(objectMapper.writeValueAsString(a));

         List<Aaw> bb = objectMapper.readValue("[{\"nn\":null,\"wocao\":\"xxx\"},{\"nn\":null,\"wocao\":\"xxx\"}]",
                 new TypeReference<List<Aaw>>() {
                 });

         System.out.println(bb);

     }

注意:@JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, isGetterVisibility = Visibility.NONE)
这个是用于设置属性的自动发现，这样就可以支持大小写，避免多生成小写。另外如果java属性名未按照规范命名，如：aaa_aa，可用该注解来直接读取属性生成json。