@jsonignore的作用

作用是json序列化时将java bean中的一些属性忽略掉,序列化和反序列化都受影响。

如下：

package com.hzboy.orm;

import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Transient;

import org.codehaus.jackson.annotate.JsonIgnore;
import org.codehaus.jackson.annotate.JsonIgnoreProperties;
import org.codehaus.jackson.annotate.JsonManagedReference;


/**
 * 系统用户实体类
 * @author tinner
 *
 */
@Entity(name = "com.hzboy.orm.User")
@Table(name = "sys_user")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class User extends BaseEntity {

    /**
     * 
     */
    private static final long serialVersionUID = -1343842065506227012L;

    public User() {

    }

    public User(Integer id) {
        this.id = id;
    }

    // 登录名
    private String loginName;
    // 密码123456-b594510740d2ac4261c1b2fe87850d08
    private String pswd;
    // 姓名
    private String nickName;
    // 性别
    private Short sex;
    // 年龄段
    private String ageStage;
    // 是否系统管理员
    private boolean systemAdmin;
    //联系电话
    private  String  tel;
    //Email
    private  String  email;
    //是否工程师
    private  Boolean  isEnginner;
    //是否前端客户    是则显示前台html,但同时保留后台相关模块
    private  Boolean  isFrontUser;
    //相关部门
    private  Department  department;
    //相关部门前台描述
    private  String   departmentName;
    private  Integer  departmentId;
    //用户编号
    private  String  userCode;
    //附加用于导入
    private  String  idCode;
    //附加的部门信息  用于计算
    private  String  departmentCode;
    @Column(name = "login_name")
    public String getLoginName() {
        return loginName;
    }

    public void setLoginName(String loginName) {
        this.loginName = loginName;
    }

    @Column(name = "pswd")
    public String getPswd() {
        return pswd;
    }

    public void setPswd(String pswd) {
        this.pswd = pswd;
    }

    @Column(name = "nick_name")
    public String getNickName() {
        return nickName;
    }

    public void setNickName(String nickName) {
        this.nickName = nickName;
    }

    @Column(name = "sex")
    public Short getSex() {
        return sex;
    }

    public void setSex(Short sex) {
        this.sex = sex;
    }

    @Column(name = "age_stage")
    public String getAgeStage() {
        return ageStage;
    }

    public void setAgeStage(String ageStage) {
        this.ageStage = ageStage;
    }

    @Column(name = "system_admin")
    public boolean isSystemAdmin() {
        return systemAdmin;
    }

    public void setSystemAdmin(boolean systemAdmin) {
        this.systemAdmin = systemAdmin;
    }

    private List<Role> roles;

    @ManyToMany(fetch = FetchType.LAZY, cascade = (CascadeType.REMOVE))
    @JoinTable(name = "sys_user_role", joinColumns = { @JoinColumn(name = "user_id") }, inverseJoinColumns = { @JoinColumn(name = "role_id") })
    public List<Role> getRoles() {
        return roles;
    }

    public void setRoles(List<Role> roles) {
        this.roles = roles;
    }

    private Integer[] roleIds;

    @Transient
    public Integer[] getRoleIds() {
        return roleIds;
    }

    public void setRoleIds(Integer[] roleIds) {
        this.roleIds = roleIds;
    }
    @Column(name="email")
    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
    @Column(name="is_enginner")
    public Boolean getIsEnginner() {
        return isEnginner;
    }

    
    public void setIsEnginner(Boolean isEnginner) {
        this.isEnginner = isEnginner;
    }
    @Column(name="is_front_user")
    public Boolean getIsFrontUser() {
        return isFrontUser;
    }

    public void setIsFrontUser(Boolean isFrontUser) {
        this.isFrontUser = isFrontUser;
    }

    public String getTel() {
        return tel;
    }

    public void setTel(String tel) {
        this.tel = tel;
    }
    @JsonIgnore 
    @ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE }, fetch = FetchType.LAZY)  
    @JoinColumn(name="department_id")
    public Department getDepartment() {
        return department;
    }
    @JsonManagedReference
    public void setDepartment(Department department) {
        this.department = department;
    }
    
    @Transient
    public String getDepartmentName() {
        return departmentName;
    }

    public void setDepartmentName(String departmentName) {
        this.departmentName = departmentName;
    }
    
    @Transient
    public Integer getDepartmentId() {
        return departmentId;
    }

    public void setDepartmentId(Integer departmentId) {
        this.departmentId = departmentId;
    }
    @Column(name="user_code")
    public String getUserCode() {
        return userCode;
    }

    public void setUserCode(String userCode) {
        this.userCode = userCode;
    }
    @Column(name="id_from_import")
    public String getIdCode() {
        return idCode;
    }

    public void setIdCode(String idCode) {
        this.idCode = idCode;
    }
    public String getDepartmentCode() {
        return departmentCode;
    }

    public void setDepartmentCode(String departmentCode) {
        this.departmentCode = departmentCode;
    }
}

上个实体User中的  department属性就在getDepartment属性上加了  @JsonIgnore,这个时候从后台推数据到前台的时候,就会把department这个引用属性给忽略掉。