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
     
       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
      
        getRoles() {        return roles;    }    public void setRoles(List
       
         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。