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。