解决奖惩信息更新页面信息id不能传到controler层，其他都可以

<form name="institutionForm" method="post" action="modifyinstitution.do?action=updateInstitution"
      onSubmit="return institutionValidate()">
    <div class="MainDiv">
        <table width="99%" border="0" cellpadding="0" cellspacing="0" class="CContent">
            <tr>
                <th class="tablestyle_title">修改奖惩信息</th>
            </tr>

            <tr>
                <td class="CPanel">
                    <table border="0" cellpadding="0" cellspacing="0" style="width:80%" align="center">
                        <tr>
                            <td align="left">
                                <input type="button" value="返回"  οnclick="tiaozhuan()" class="button"/>
                            </td>
                        </tr>
                        <tr>
                            <td width="100%">
                                <fieldset style="height:100%;">
                                    <legend>修改奖惩信息</legend>
				<input type="hidden" name="id" value=""/ >
                                    <table border="0" cellpadding="2" cellspacing="1" style="width:100%">
                                        <tr>
                                            <td nowrap align="right" width="11%">奖惩对象：</td>
                                            <td width="89%"><input name="name" type="text" class="input" value="${updateDetail.username}"
                                                                   placeholder="请选择" οnclick="chooseUser('1')"
                                                                   data-toggle="modal"  data-target="#myModal" id="userName"
                                            />
                                                <span class="red">*</span></td>
                                        </tr>
                                        <tr>
                                            <input id="usernameTemp" type="hidden"  value="" />
                                            <input id="userIdTemp" type="hidden" name="userid" value=""/>
                                        </tr>
                                        <tr>
                                            <td nowrap align="right" width="11%">奖惩类型：</td>
                                            <td><input name="type" type="text" class="input"
                                                       value="${updateDetail.type}"/>
                                                <span class="red">*</span></td>
                                        </tr>

                                        <tr>
                                            <td width="11%" nowrap align="right">奖惩说明：</td>
                                            <td><textarea name="content" cols="100" rows="6" class="input"
                                                              id="explain" ><c:out value="${updateDetail.content}"/></textarea></td>
                                        </tr>
                                        <tr>
                                            <input  name="id" value="${updateDetail.id}"/>
                                            <input  name="msgid" value="${updateDetail.msgid}"/>
                                            <input  name="userid" value="${updateDetail.userid}"/>
                                        </tr>
                                    </table>
                                </fieldset>
                            </td>

                        </tr>
                    </table>
                </td>
            </tr>
            <tr>
                <td colspan="2" align="center" height="50px">
                    <input name="提交" type="submit" class="button" value="保存"/>　

                    <input name="重置" type="reset" class="button" value="重置"/></TD>
            </tr>



            </table>
        </table>
    </div>
</form>

用form表单提交我的其他实体里面的东西都传过来了，就是id传不过来。开始查错，

第一，怀疑没拿到返回到更新奖惩信息的页面。把type="hidden"删除，发现可以打印出来，就证明不是这里的原因。怀疑是id这个名字有问题，如果修改了前台以前name为id的input，修改成name="rapid" ,好的，修改了这里的name,后台controler接受的是institutuion实体，要想接受到该值，就必须修改实体，两种方法

1）添加一个实体Rap，在实体里面加入rapid字段，查看返回的rapid，发现可以接受到,好吧，我开始觉得问题出id名字上面了。

2）在实体institution里面添加rapid字段。把前端传过来的rapid接收

package com.jointem.hrm.entity;

import java.beans.Transient;
import java.io.Serializable;
import java.util.Date;


public class Institution implements Serializable {
	private Integer msgid;
	private Integer id;
	private Integer userid;
	private String type;
	private String content;
	private Date  createtime;
	private Users users;
	private Message message;
	@Transient
	private Integer repid;
	public Integer getId() {
		if(null != repid){
			return id = repid;
		}else{
			return id;
		}
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public Integer getUserid() {
		return userid;
	}
	public void setUserid(Integer userid) {
		this.userid = userid;
	}
	public String getType() {
		return type;
	}
	public void setType(String type) {
		this.type = type;
	}
	public String getContent() {
		return content;
	}
	public void setContent(String content) {
		this.content = content;
	}
	public Date getCreatetime() {
		return createtime;
	}
	public void setCreatetime(Date createtime) {
		this.createtime = createtime;
	}


	public Users getUser() {
		return users;
	}
	public void setUser(Users user) {
		this.users = users;
	}
	public Message getMessage() {
		return message;
	}

	public void setMessage(Message message) {
		this.message = message;
	}

	public Integer getMsgid() {
		return msgid;
	}
	public void setMsgid(Integer msgid) {
		this.msgid = msgid;
	}
	
	public Integer getRepid() {
		return repid;
	}

	public void setRepid(Integer repid) {
		this.repid = repid;
	}

	@Override
	public String toString() {
		return "Institution [msgid=" + msgid + ", id=" + id + ", userid=" + userid + ", type=" + type + ", content="
				+ content + ", createtime=" + createtime + "]";
	}

}

看我加粗的那段代码逻辑，可是传过来的还是id是null,问题就不是出现在id名字问题上了。在更新页面上查是不是“id”这个name与其他的冲突了，发现果然是。看我第一段代码，其中加粗标红的也是id为name，且value值是Null，还排在hidden的input前面，所以不管怎样我获取到的id都是null.把那个重复的删除即可。