form表单回写技术java实现

本文实例为大家分享了form表单回写技术，供大家参考，具体内容如下

回写支持的java拼js的方法：

 /**
   * 回写表单
   *
   * @param mRequest
   * @return
   */
  public static String writeBackMapToForm(Map mRequest) {
    return writeBackMapToForm(mRequest, new String[]{}, "writeBackMapToForm");
  }
  /**
   * 回写表单
   *
   * @param mRequest
   * @param ignoreName 定义哪些key值的input不回写
   * @return
   */
  public static String writeBackMapToForm(Map mRequest, String[] ignoreName, String jsFunctionName) {
  mRequest.remove("checkbox_template"); //不回写列表中checkbox的值
    StringBuffer rtValue = new StringBuffer();
    rtValue.append(" var mForm = new Object();\n");
    rtValue.append(" var indexArray = new Array();\n");
    rtValue.append(" function writeBackMapToForm() {\n");
    Iterator itMRequest = mRequest.keySet().iterator();
    while (itMRequest.hasNext()) {
      String tempKey = (String) itMRequest.next();
      Object tempValue = mRequest.get(tempKey);
      if (tempKey.startsWith("VENUS") || tempKey.startsWith("RANMIN")) {
        continue;
      }
      if (RmStringHelper.ArrayContainString(ignoreName, tempKey)) {
        continue;
      }
      String tempValueNew = "";
      if (tempValue instanceof String) { //如果是单值，直接注入
        tempValueNew = RmStringHelper.replaceStringToScript((String)tempValue); //从数据库中取出来以后需要转换1次
        rtValue.append("  indexArray[indexArray.length] = \"" + tempKey + "\";\n");
        rtValue.append("  mForm[\"" + tempKey + "\"] = \"" + tempValueNew + "\";\n");
      } else if (tempValue instanceof String[]) { //如果是多值，放入数组
        rtValue.append("  indexArray[indexArray.length] = \"" + tempKey + "\";\n");
        String[] myArray = (String[]) tempValue;
        if ( tempKey.equals("cmd") ){
          tempValueNew = RmStringHelper.replaceStringToScript(myArray[0]);
          rtValue.append("  mForm[\"" + tempKey + "\"] = \"" + tempValueNew + "\";\n");
        } else {
          rtValue.append("  mForm[\"" + tempKey + "\"] = [");
          for (int i = 0; i < myArray.length; i++) {
            if (i > 0)
              rtValue.append(",");
            tempValueNew = RmStringHelper.replaceStringToScript(myArray[i]);
            rtValue.append("\"" + tempValueNew + "\"");
          }
          rtValue.append("];\n");
        }
      } else if (tempValue instanceof Timestamp) { //如果是时间戳，直接注入
        if(tempValue == null) {
          continue;
        }
        tempValueNew = RmStringHelper.replaceStringToScript(tempValue.toString().substring(0,19));
        rtValue.append("  indexArray[indexArray.length] = \"" + tempKey + "\";\n");
        rtValue.append("  mForm[\"" + tempKey + "\"] = \"" + tempValueNew + "\";\n");
      } else if (tempValue instanceof BigDecimal){
        tempValueNew = RmStringHelper.replaceStringToScript(tempValue.toString());
    rtValue.append("  indexArray[indexArray.length] = \""
        + tempKey + "\";\n");
    rtValue.append("  mForm[\"" + tempKey + "\"] = \""
        + tempValueNew + "\";\n");
      } else {
        if(tempValue != null) {
          RmStringHelper.log("在回写页面时，遇到了未知java类型:" + tempValue);
        }
        continue;
      }
    }
    rtValue.append("  for(var i=0; i<indexArray.length; i++) {\n");
    rtValue.append("   writeBackValue(indexArray[i]);\n");
    rtValue.append("  }\n");
    rtValue.append(" }\n");
    rtValue.append(jsFunctionName + "();\n");
    return rtValue.toString();
  }
//通过此方法将request中的值放入mForm对象中
var mForm = new Object();
 var indexArray = new Array();
 function writeBackMapToForm() {
  indexArray[indexArray.length] = "att_id";
  mForm["att_id"] = "";
  indexArray[indexArray.length] = "businessTypeOID";
  mForm["businessTypeOID"] = [""];
  indexArray[indexArray.length] = "business_type1";
  mForm["business_type1"] = "";
  indexArray[indexArray.length] = "business_type2";
  mForm["business_type2"] = "1";
  indexArray[indexArray.length] = "cmd";
  mForm["cmd"] = "saveExamineRule";
  indexArray[indexArray.length] = "document_content";
  mForm["document_content"] = "s2";
  indexArray[indexArray.length] = "file_path";
  mForm["file_path"] = "";
  indexArray[indexArray.length] = "file_template";
  mForm["file_template"] = "";
  indexArray[indexArray.length] = "gxl";
  mForm["gxl"] = "null";
  indexArray[indexArray.length] = "owner_id";
  mForm["owner_id"] = "s1";
  for(var i=0; i<indexArray.length; i++) {
   writeBackValue(indexArray[i]);
  }
 }
writeBackMapToForm();

关键语句jsp页面中加入后输出调用js方法：

<script language="javascript">
<% //表单回写
  if(request.getAttribute(RuleExamineConstants.REQUEST_WRITE_BACK_FORM_VALUES) != null) { //如果request中取出的表单回写bean不为空
    out.print(RmVoHelper.writeBackMapToForm((java.util.Map)request.getAttribute(RuleExamineConstants.REQUEST_WRITE_BACK_FORM_VALUES))); //输出表单回写方法的脚本
  }
 Map mapt = (java.util.Map)request.getAttribute(RuleExamineConstants.REQUEST_WRITE_BACK_FORM_VALUES);
 System.out.print("infois:"+mapt.entrySet());
 out.print("alert(1);");
%>
</script>

//上面语句实际上注入的js格式内容如：
var mForm = new Object();
 var indexArray = new Array();
 function writeBackMapToForm() {
  indexArray[indexArray.length] = "_function_id_";
  mForm["_function_id_"] = "3670212500000000050";
  indexArray[indexArray.length] = "cmd";
  mForm["cmd"] = "listBusinessTypePage";
  for(var i=0; i<indexArray.length; i++) {
   writeBackValue(indexArray[i]);
  }
 }
writeBackMapToForm();

//注入后调用js回写表单方法
function writeBackValue(inputName) {
if(form.elements[inputName] == undefined) {
  return false;
}
if(form.elements[inputName].value != undefined) {
  form.elements[inputName].value = mForm[inputName];
}
if(form.elements[inputName].length != undefined ) {
  var thisValue = mForm[inputName];
  if(mForm[inputName][0] == undefined) {
    thisValue = new Array();
    thisValue[thisValue.length] = mForm[inputName];
  }
  if(form.elements[inputName].length != null) {
    var tempLength = form.elements[inputName].length;
    for(var j=0; j<tempLength; j++) {
      var thisObj = form.elements[inputName][j];
      for(var k=0; k<thisValue.length; k++) {
        if(thisObj.value == thisValue[k]) {
          if( thisObj.checked != undefined) {
            thisObj.checked = true;
            break;
          } else if( thisObj.selected != undefined) {
            thisObj.selected = true;
            break;
          }
        } else {
          if( thisObj.checked != undefined) {
            thisObj.checked = false;
          } else if( thisObj.selected != undefined) {
            thisObj.selected = false;
            }
          }
        }
      }
    }  

  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助。