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。