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 + "]";
    }
}