Hibernate 多对多关联 中间表有多个字段如何配置

例如 ：学生 与课程之间是多对多关联，中间表不仅有学生表和课程表的主键，中间表还有其他字段（成绩等），该如何配置，用
JPA如何设置，望大家指点指点|

一个事例：
LoginInfo.hbm.xml
[code="xml"]

















[/code]

LoginInfo对象
[code="java"]
package com.ucit.ca.webApp.po;

/**

• CasUserModuleInfo entity. @author MyEclipse Persistence Tools */

public class LoginInfo implements java.io.Serializable {
// Fields
private String lid;
private Uinfo uinfo;
private Module module;
private User user;

// Constructors

/** default constructor */
public LoginInfo() {
}

/** full constructor */
public LoginInfo(Uinfo uinfo, Module module, User user) {
    this.uinfo = uinfo;
    this.module = module;
    this.user = user;
}

// Property accessors

public Uinfo getUinfo() {
    return uinfo;
}

public String getLid() {
    return lid;
}

public void setLid(String lid) {
    this.lid = lid;
}

public void setUinfo(Uinfo uinfo) {
    this.uinfo = uinfo;
}

public Module getModule() {
    return module;
}

public void setModule(Module module) {
    this.module = module;
}

public User getUser() {
    return user;
}

public void setUser(User user) {
    this.user = user;
}

@Override
public boolean equals(Object other) {
    if ((this == other))
        return true;
    if ((other == null))
        return false;
    if (!(other instanceof LoginInfo))
        return false;
    LoginInfo castOther = (LoginInfo) other;

    return ((this.getUser() == castOther.getUser()) || (this.getUser() != null
            && castOther.getUser() != null && this.getUser().equals(
            castOther.getUser())))
            && ((this.getUinfo() == castOther.getUinfo()) || (this
                    .getUinfo() != null
                    && castOther.getUinfo() != null && this.getUinfo()
                    .equals(castOther.getUinfo())))
            && ((this.getModule() == castOther.getModule()) || (this
                    .getModule() != null
                    && castOther.getModule() != null && this.getModule()
                    .equals(castOther.getModule())));
}

@Override
public int hashCode() {
    return "com.ucit.ca.webApp.po.LoginInfo".hashCode();
}

}
[/code]

具体字段再加就是了

Hibernate多对多关联不是很好用，建议设置一个关联表，将多对多变成两个一对多来处理