hibernate多對多 前臺死循環問題

錯誤：

 

 

後臺debug正常時 hibernate能夠正常查找

前臺

 

 

解決：1在web.xml 加入hibernate 延遲加載的過濾器（springmvc過濾器前）

<!--hibernate延遲加載 解決-->
  <filter>
    <filter-name>hibernateFilter</filter-name>
    <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
    <init-param>
      <param-name>sessionFactoryBeanName</param-name>
      <param-value>sessionFactory</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>hibernateFilter</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>FORWARD</dispatcher>
  </filter-mapping>

2在對應實體類加註解@JsonBackReference

package com.shiro.pojo;

import com.demo.pojo.BaseEntity;
import com.fasterxml.jackson.annotation.JsonBackReference;
import com.fasterxml.jackson.annotation.JsonIgnore;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
import javax.persistence.Transient;



@Entity
@Table(name="t_user")
public class User extends BaseEntity {


    private String username;
    private String password;
    private List<Role> roleList;//一個用戶具備多個角色


    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    @JsonBackReference//這裏！
    @ManyToMany
    @JoinTable(name="t_user_role",joinColumns={@JoinColumn(name="user_id")},inverseJoinColumns={@JoinColumn(name="role_id")})
    public List<Role> getRoleList() {
        return roleList;
    }
    public void setRoleList(List<Role> roleList) {
        this.roleList = roleList;
    }

    @Transient
    public Set<String> getRolesName(){
        List<Role> roles=getRoleList();
        Set<String> set=new HashSet<String>();
        for (Role role : roles) {
            set.add(role.getRolename());
        }
        return set;
    }

}

package com.shiro.pojo;
import com.demo.pojo.BaseEntity;
import com.fasterxml.jackson.annotation.JsonBackReference;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Transient;

@Entity
@Table(name="t_role")
public class Role extends BaseEntity {


    private String rolename;
    private List<Permission> permissionList;//一個角色對應多個權限
    private List<User> userList;//一個角色對應多個用戶


    public String getRolename() {
        return rolename;
    }
    public void setRolename(String rolename) {
        this.rolename = rolename;
    }
    @JsonBackReference//這裏！
    @OneToMany(mappedBy="role")
    public List<Permission> getPermissionList() {
        return permissionList;
    }
    public void setPermissionList(List<Permission> permissionList) {
        this.permissionList = permissionList;
    }
    @ManyToMany
    @JoinTable(name="t_user_role",joinColumns={@JoinColumn(name="role_id")},inverseJoinColumns={@JoinColumn(name="user_id")})
    public List<User> getUserList() {
        return userList;
    }
    public void setUserList(List<User> userList) {
        this.userList = userList;
    }

    @Transient
    public List<String> getPermissionsName(){
        List<String> list=new ArrayList<String>();
        List<Permission> perlist=getPermissionList();
        for (Permission per : perlist) {
            list.add(per.getPermissionname());
        }
        return list;
    }
}

遺留問題 這個過濾器的做用  註解的做用