6.17 映射关系---很重要

demo1 实际项目中经常用到---综合本章很多知识点。

class Member {
	private String mid ;
	private String name ;
	private Role roles [] ; 
	public Member(String mid,String name) {
		this.mid = mid ;
		this.name = name ;
	}
	public void setRoles(Role roles[]) {
		this.roles = roles ;
	}
	public Role [] getRoles() {
		return this.roles ;
	}
	public String getInfo() {
		return "【用户信息】mid = " + this.mid + "、name = " + this.name ;
	}
}

class Role {
	private long rid ;
	private String title ;
	private Member members [] ;
	private Privilege privileges [] ;
	public Role(long rid,String title) {
		this.rid = rid ;
		this.title = title ;
	}
	public void setMembers(Member members []) {
		this.members = members ;
	}
	public Member [] getMembers() {
		return this.members ;
	}
	public void setPrivileges(Privilege privileges []) {
		this.privileges = privileges ;
	}
	public Privilege [] getPrivileges() {
		return this.privileges ;
	}
	public String getInfo() {
		return "【角色信息】rid = " + this.rid + "、title = " + this.title ;
	}
}

class Privilege {
	private long pid ;
	private String title ;
	private Role role ;
	public Privilege(long pid,String title) {
		this.pid = pid ;
		this.title = title ;
	}
	public void setRole(Role role) {
		this.role = role ;
	}
	public Role getRole() {
		return this.role ;
	}
	public String getInfo() {
		return "【权限信息】pid = " + this.pid + "、title = " + this.title ;
	}
}

public class HelloWorld {
	public static void main(String args[]) {
		// 第一步：根据结构设置对象数据
		Member memA = new Member("mldn-a","张三") ;
		Member memB = new Member("mldn-b","李四") ;
		Role roleA = new Role(1L,"系统配置") ;
		Role roleB = new Role(2L,"备份管理") ;
		Role roleC = new Role(3L,"人事管理") ;
		Privilege priA = new Privilege(1000L,"系统初始化") ;
		Privilege priB = new Privilege(1001L,"系统系统还原") ;
		Privilege priC = new Privilege(1002L,"系统环境修改") ;
		Privilege priD = new Privilege(2000L,"备份员工数据") ;
		Privilege priE = new Privilege(2001L,"备份部门数据") ;
		Privilege priF = new Privilege(2002L,"备份公文数据") ;
		Privilege priG = new Privilege(3000L,"增加员工") ;
		Privilege priH = new Privilege(3001L,"编辑员工") ;
		Privilege priI = new Privilege(3002L,"浏览员工") ;
		Privilege priJ = new Privilege(3003L,"员工离职") ;
		// 增加角色与权限的对应关系
		roleA.setPrivileges(new Privilege[] {priA,priB,priC}) ;
		roleB.setPrivileges(new Privilege[] {priD,priE,priF}) ;
		roleC.setPrivileges(new Privilege[] {priG,priH,priI,priJ}) ;

		// 增加权限与角色对应
		priA.setRole(roleA) ;
		priB.setRole(roleA) ;
		priC.setRole(roleA) ;
		priD.setRole(roleB) ;
		priE.setRole(roleB) ;
		priF.setRole(roleB) ;
		priG.setRole(roleC) ;
		priH.setRole(roleC) ;
		priI.setRole(roleC) ;
		priJ.setRole(roleC) ;

		// 增加用户与角色的对应关系
		memA.setRoles(new Role[] {roleA,roleB}) ;
		memB.setRoles(new Role[] {roleA,roleB,roleC}) ;
		roleA.setMembers(new Member[] {memA,memB}) ;
		roleB.setMembers(new Member[] {memA,memB}) ;
		roleC.setMembers(new Member[] {memB}) ;

		// 第二步：根据要求获取数据
		System.out.println("------ 通过用户查找信息 ------") ;
		System.out.println(memB.getInfo()) ;
		for (int x = 0 ; x < memB.getRoles().length ; x ++) {
			System.out.println("\t|- " + memB.getRoles()[x].getInfo()) ;
			for (int y = 0 ; y < memB.getRoles()[x].getPrivileges().length ; y ++) {
				System.out.println("\t\t|- " + memB.getRoles()[x].getPrivileges()[y].getInfo()) ;
			}
		}

		System.out.println("------ 通过角色查找信息 ------") ;
		System.out.println(roleB.getInfo()) ;
		System.out.println("\t|- 浏览此角色下的所有权限信息：") ;
		for (int x = 0 ; x < roleB.getPrivileges().length ; x ++) {
			System.out.println("\t\t|- " + roleB.getPrivileges()[x].getInfo()) ;
		}
		System.out.println("\t|- 浏览此角色下的所有用户信息：") ;
		for (int x = 0 ; x < roleB.getMembers().length ; x ++) {
			System.out.println("\t\t|- " + roleB.getMembers()[x].getInfo()) ;
		}
        
		System.out.println("------ 通过权限查找信息 ------") ;
		System.out.println(priA.getInfo()) ;
		for (int x = 0 ; x < priA.getRole().getMembers().length ; x++) {
			System.out.println("\t|- " + priA.getRole().getMembers()[x].getInfo()) ;
		}
	}
}