关于《hibernate多对多》有中间表的建立

角色 与 菜单（资源）的多对多关系，在这里我们建立中间表，用两个oneToMany实现

实体类：

　　角色（GmRole）  菜单（GmMenu） 中间表（GmRoleRight）

1.在角色实体中

package com.bossy.gun.entity;

import java.util.HashSet;

import java.util.Set;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.FetchType;

import javax.persistence.Id;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="gm_role")

public class GmRole  implements java.io.Serializable {

    private static final long serialVersionUID = 2740105939852999578L;

    private String roleId;

     private String roleName;

     private String roleState;

     private Set<GmRoleRight> gmRoleRights = new HashSet<GmRoleRight>(0);

    public GmRole() {

    }

    public GmRole(String roleId) {

        this.roleId = roleId;

    }

    public GmRole(String roleId, String roleName, String roleState, Set<GmRoleRight> gmRoleRights) {

        this.roleId = roleId;

        this.roleName = roleName;

        this.roleState = roleState;

        this.gmRoleRights = gmRoleRights;

    }

    @Id

    @Column(name="role_id", unique=true, nullable=false, length=50)

    public String getRoleId() {

        return this.roleId;

    }

    public void setRoleId(String roleId) {

        this.roleId = roleId;

    }

    @Column(name="role_name", length=100)

    public String getRoleName() {

        return this.roleName;

    }

    public void setRoleName(String roleName) {

        this.roleName = roleName;

    }

    @Column(name="role_state", length=10)

    public String getRoleState() {

        return this.roleState;

    }

    public void setRoleState(String roleState) {

        this.roleState = roleState;

    }

    @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="gmRole")

    public Set<GmRoleRight> getGmRoleRights() {

        return this.gmRoleRights;

    }

    public void setGmRoleRights(Set<GmRoleRight> gmRoleRights) {

        this.gmRoleRights = gmRoleRights;

    }

    @Override

    public String toString() {

        return "GmRole [roleId=" + roleId + ", roleName=" + roleName

                + ", roleState=" + roleState + ", gmRoleRights=" + gmRoleRights

                + "]";

    }

}　　

　　2.菜单实体中

package com.bossy.gun.entity;

import java.util.HashSet;

import java.util.Set;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.FetchType;

import javax.persistence.Id;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="gm_menu")

public class GmMenu  implements java.io.Serializable {

    private static final long serialVersionUID = -4791621393144183524L;

    private String menuId;

     private String menuFaId;

     private String menuName;

     private String menuIoc;

     private String menuLink;

     private String menuSort;

     private String menuState;

     private String menuType;

     private String menuCkname;

     private Set<GmRoleRight> gmRoleRights = new HashSet<GmRoleRight>(0);

    public GmMenu() {

    }

    public GmMenu(String menuId) {

        this.menuId = menuId;

    }

    public GmMenu(String menuId, String menuFaId, String menuName, String menuIoc, String menuLink, String menuSort, String menuState,String menuType,String menuCkname, Set<GmRoleRight>  gmRoleRights) {

        this.menuId = menuId;

        this.menuFaId = menuFaId;

        this.menuName = menuName;

        this.menuIoc = menuIoc;

        this.menuLink = menuLink;

        this.menuSort = menuSort;

        this.menuState = menuState;

        this.gmRoleRights = gmRoleRights;

        this.menuType = menuType;

        this.menuCkname = menuCkname;

    }

    @Id

    @Column(name="menu_id", unique=true, nullable=false, length=50)

    public String getMenuId() {

        return this.menuId;

    }

    public void setMenuId(String menuId) {

        this.menuId = menuId;

    }

    @Column(name="menu_fa_id", length=50)

    public String getMenuFaId() {

        return this.menuFaId;

    }

    public void setMenuFaId(String menuFaId) {

        this.menuFaId = menuFaId;

    }

    @Column(name="menu_name", length=100)

    public String getMenuName() {

        return this.menuName;

    }

    public void setMenuName(String menuName) {

        this.menuName = menuName;

    }

    @Column(name="menu_ioc", length=200)

    public String getMenuIoc() {

        return this.menuIoc;

    }

    public void setMenuIoc(String menuIoc) {

        this.menuIoc = menuIoc;

    }

    @Column(name="menu_link", length=400)

    public String getMenuLink() {

        return this.menuLink;

    }

    public void setMenuLink(String menuLink) {

        this.menuLink = menuLink;

    }

    @Column(name="menu_sort", length=10)

    public String getMenuSort() {

        return this.menuSort;

    }

    public void setMenuSort(String menuSort) {

        this.menuSort = menuSort;

    }

    @Column(name="menu_state", length=10)

    public String getMenuState() {

        return this.menuState;

    }

    public void setMenuState(String menuState) {

        this.menuState = menuState;

    }

    @Column(name="menu_type", length=10)

    public String getMenuType() {

        return menuType;

    }

    public void setMenuType(String menuType) {

        this.menuType = menuType;

    }

     @Column(name="menu_ckname", length=10)

    public String getMenuCkname() {

        return menuCkname;

    }

    public void setMenuCkname(String menuCkname) {

        this.menuCkname = menuCkname;

    }

    @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="gmMenu")

    public Set<GmRoleRight> getGmRoleRights() {

        return gmRoleRights;

    }

    public void setGmRoleRights(Set<GmRoleRight> gmRoleRights) {

        this.gmRoleRights = gmRoleRights;

    }

}

3.中间表中

package com.bossy.gun.entity;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.FetchType;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.ManyToOne;

import javax.persistence.Table;

@Entity

@Table(name = "gm_role_right")

public class GmRoleRight implements java.io.Serializable {

    private static final long serialVersionUID = -1245261414803172237L;

        private String grrId;

        private String grrState;

        private GmRole gmRole;

        private GmMenu gmMenu;

    public GmRoleRight() {

    }

    public GmRoleRight(String grrId) {

        this.grrId = grrId;

    }

    public GmRoleRight(String grrId, String grrState, GmRole gmRole,

            GmMenu gmMenu) {

        super();

        this.grrId = grrId;

        this.grrState = grrState;

        this.gmRole = gmRole;

        this.gmMenu = gmMenu;

    }

    @Id

    @Column(name = "grr_id", unique = true, nullable = false, length = 50)

    public String getGrrId() {

        return this.grrId;

    }

    public void setGrrId(String grrId) {

        this.grrId = grrId;

    }

    @Column(name = "grr_state", length = 50)

    public String getGrrState() {

        return this.grrState;

    }

    public void setGrrState(String grrState) {

        this.grrState = grrState;

    }

    @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)

    @JoinColumn(name="role_id")

    public GmRole getGmRole() {

        return this.gmRole;

    }

    public void setGmRole(GmRole gmRole) {

        this.gmRole = gmRole;

    }

    @ManyToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)

    @JoinColumn(name="menu_id")

    public GmMenu getGmMenu() {

        return gmMenu;

    }

    public void setGmMenu(GmMenu gmMenu) {

        this.gmMenu = gmMenu;

    }

    @Override

    public String toString() {

        return "GmRoleRight [grrId=" + grrId + ", grrState=" + grrState

                + ", gmRole=" + gmRole + ", gmMenu=" + gmMenu + "]";

    }

}