本篇文章为大家展示了Java项目中前台如何向后台传递参数，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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1.传字符串的形式，字符串中每个id用 “，” 隔开
打印出来如下形式：
前台JS代码
function saveRoleAdd()
{
var roleNames = $('#roleNames').textbox("getText");
var roleDetail = {};
roleDetail.roleNames = roleNames;
roleDetail.roleFunctionCount = 0;
roleDetail.roleFunctionList = [];
if(roleNames.length < 0 || roleNames.length == 0)
{
$.messager.alert("提示","请输入角色名");
return;
}
var funNodeList = $('#roleFuntionTree').tree('getChecked', 'indeterminate');
var funLeafList = $('#roleFuntionTree').tree('getChecked');
if(funNodeList.length <=0 && funLeafList.length <= 0)
{
$.messager.alert("提示","请选择权限节点");
return;
}
Array.prototype.push.apply(funNodeList, funLeafList); //将两个lis合并为一个数组
var roleFunList = "";
var roleFunNameList = "";
for(var i=0; i < funNodeList.length; i++)
{
if (!isEmptyTarget(funNodeList[i].id))
{
if(!isEmptyTarget(roleFunList))
{
roleFunList += ","; //拼接成用逗号隔开的字符串,里面是id
roleFunNameList += ","; //拼接成用逗号隔开的字符串，里面text
}
roleFunList += funNodeList[i].id;
roleFunNameList += funNodeList[i].text;
var funDetail = {};
funDetail.funId = parseInt(funNodeList[i].id);
roleDetail.roleFunctionList.push(funDetail);
}
}
roleDetail.roleFunctionCount = roleDetail.roleFunctionList.length;
var rows = $("#tblRoleDetail").datagrid("getRows");
for (var i = 0; i < rows.length; i++)
{
if (roleNames == rows[i].roleNames)
{
$.messager.alert("提示","重复的角色名!");
return;
}
}
$('#tblRoleDetail').datagrid('appendRow',
{
roleNames:roleNames,
funId:roleFunNameList
}
);
$.ajax(
{
type : "POST",
url : "permiss-manager/setRoleDetail.action?_dc=" + Math.random(),
data :
{
roleName:roleNames,
roleDetailData : roleFunList,
},
dataType : "json",
success : function(result)
{
$.messager.alert("提示",result.result);
closeRoleAdd();
refreshRoleSelectTree();
}
});
$('#rolePanel').panel('refresh', "afc/page/permission-manager/role-main.jsp");
}后台Action方法代码
@Action("setRoleDetail")
public void setRoleDetail()
{
webLogService.writeWebLog(ServletActionContext.getRequest().getSession().getAttribute("userId").toString(), "新增角色", ServletActionContext.getRequest().getRemoteAddr());
String roleName = ServletActionContext.getRequest().getParameter("roleName");
String roleDetailJsonData = ServletActionContext.getRequest().getParameter("roleDetailData");
// 这一部分就是转成一个list。下面调用方式直接传一个list过去
List funIdList = new ArrayList();
String [] arrar = StringUtils.split(roleDetailJsonData, ",");
for (int i = 0; i < arrar.length; i++)
{
Integer funId = null;
if(NumberUtils.isNumber(arrar[i]))
{
funId = NumberUtils.toInt(arrar[i]);
funIdList.add(funId);
}
}
permissionService.setRole(roleName, funIdList);
try
{
HttpServletResponse response = ServletActionContext.getResponse();
response.setCharacterEncoding("utf-8");
JSONObject result = new JSONObject();
result.accumulate("result", "角色新增成功");
response.getWriter().write(result.toString());
} catch (Exception e)
{
e.printStackTrace();
}
} 2.直接传一个数组到后台
前台JS代码
function saveRoleEdit()
{
var roleNames = $('#roleNames').textbox("getText");
var roleDetail = {};
roleDetail.roleFunctionCount = 0;
roleDetail.roleFunctionList = [];
if(roleNames.length < 0 || roleNames.length == 0)
{
$.messager.alert("提示","请输入角色名");
return;
}
var funNodeList = $("#roleFuntionTree").tree('getChecked','indeterminate');
var funLeafList = $('#roleFuntionTree').tree('getChecked');
if(funNodeList.length <=0 && funLeafList.length <= 0)
{
$.messager.alert("提示","请选择权限节点");
return;
}
Array.prototype.push.apply(funNodeList, funLeafList); // funNodeList,funLeafList两个数组都变成合并后的数组
var roleFunArray = [];
for(var i=0; i < funNodeList.length; i++)
{
if (!isEmptyTarget(funNodeList[i].id))
{
roleFunArray.push(funNodeList[i].id);
}
}
alert("权限ID Array为 ：" + JSON.stringify(roleFunArray));
$.ajax(
{
type : "POST",
url : "permiss-manager/modifyRoleAuthority.action?_dc=" + Math.random(),
data :
{
roleName:roleNames,
roleDetailStr:JSON.stringify(roleFunArray),
},
success : function(result)
{
if(result == "success")
{
$.messager.alert("提示","修改权限成功！","info");
editRoleDialog();
refreshRoleSelectTree();
}
else
{
$.messager.alert("提示","修改权限失败！","info");
}
}
});
}后台Action方法
@Action("modifyRoleAuthority")
public void modifyRoleAuthority() throws IOException
{
HttpServletResponse response = ServletActionContext.getResponse();
response.setCharacterEncoding("utf-8");
webLogService.writeWebLog(ServletActionContext.getRequest().getSession().getAttribute("userId").toString(), "权限给予", ServletActionContext.getRequest().getRemoteAddr());
String roleName = ServletActionContext.getRequest().getParameter("roleName");
String newFuncListStr = ServletActionContext.getRequest().getParameter("roleDetailStr");
if(!StringUtils.isEmpty(roleName) && !StringUtils.isEmpty(newFuncListStr))
{
List newFuncList = new ArrayList();
//这种方法可以把前台传过来的String类型的值 每个转化成int 因为我这里之前dao爆了 就是因为String不能转化为Int的原因 这里可以转一下
JSONArray mJSONArray= JSONArray.fromObject(newFuncListStr);
newFuncList = Arrays.asList((Integer[])JSONArray.toArray(mJSONArray, Integer.class));
if(!newFuncList.isEmpty())
{
if(permissionService.setRole(roleName, newFuncList))
{
response.getWriter().write("success");
}
else
{
response.getWriter().write("fail");
}
}
}
} 上述内容就是Java项目中前台如何向后台传递参数，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注创新互联行业资讯频道。