如何使用struts2中的ajax將數據從動作類獲取到jsp？

-1

我是新來的ajax，並希望從行動類到jsp的數據。如何使用struts2中的ajax將數據從動作類獲取到jsp？

文件：getRole.jsp

<head> 
<script type="text/javascript"> 
var request; 
function loaddata() 
{ 
    var id = document.getElementById("newRole").value; 
    alert("hi : "+ id); 
    var xhttp; 
     xhttp = new XMLHttpRequest(); 
     xhttp.onreadystatechange = function() { 
     if (this.readyState == 4 && this.status == 200) { 
      document.getElementById("display_info").innerHTML = this.responseText; 
      } 
     }; 
     xhttp.open("GET", "loadData?id="+id, true); 
     xhttp.send(); 
} 

</script> 
</head> 
<body> 
<div class="container-fluid"> 
    <div class="col-sm-2"></div> 
    <div class="col-sm-8"> 
     <label for="focusedInput" id="abc"><h4>Enter Id : </h4></label> 
     <input type="text" class="form-control" name="newRole" id="newRole" onkeyup="loaddata();"> 
     <div id="display_info" ></div> 
    </div> 
    <div class="col-sm-2"></div> 
</div> 
</body>

文件：loadData.java

public class loadData extends ActionSupport implements ServletRequestAware, ServletResponseAware{ 

private static final long serialVersionUID = 1L; 
String url = "jdbc:mysql://localhost:3306/struts"; 
String user = "username"; 
String pass = "password"; 
HttpServletRequest request; 
HttpServletResponse response; 

@Override 
public void setServletRequest(HttpServletRequest request) { 
    // TODO Auto-generated method stub 
    this.request = request; 
} 

public HttpServletRequest getServletRequest() { 
    return request; 
} 

@Override 
public void setServletResponse(HttpServletResponse response) { 
    // TODO Auto-generated method stub 
    this.response = response; 
} 

public HttpServletResponse getServletResponse() 
{ 
    return response; 
} 

public String execute() 
{ 
    try{ 
     String id = request.getParameter("id"); 
     String name = "null."; 
     System.out.println("in servlet : " + id); 

     Class.forName("com.mysql.jdbc.Driver"); 
     java.sql.Connection con =DriverManager.getConnection(url, user, pass); 

     String s = "select * from tempemp where id="+id; 
     Statement st = con.createStatement(); 
     ResultSet rs = st.executeQuery(s); 

     while(rs.next()) 
     { 
      name = rs.getString("role"); 
      System.out.println(name); 
     } 
     PrintWriter out = response.getWriter(); 
     out.println("Name: "+name); 
     con.close(); 
    } 
    catch(Exception e){ 
     e.printStackTrace(); 
    } 
    return SUCCESS; 
} 
}

我想基於這個Id從用戶那裏得到ID，然後打印作用。我只想使用ajax而不是json。所以請只回答我的ajax代碼。

來源

2017-02-20 Parth Patel

您必須在操作中返回null而不是成功。返回null將不做進一步處理它只會發送當前響應給客戶端。

返回SUCCESS將搜索爲struts.xml文件中的結果定義的特定jsp頁面。

this.responseText你會得到你的name。對於更多的參考https://struts.apache.org/docs/ajax.html

來源

2017-02-20 11:39:56 udaybhaskar

我也試試這個代碼。 response.setContentType（「text/plain」）; response.setCharacterEncoding（「UTF-8」）; response.getWriter（）。write（name）; –

@ParthPatel這將完全起作用。 – udaybhaskar

Thanx @udaybhaskar。我將「成功」更改爲「無效」，它的工作原理。你能解釋一下爲什麼「null」的結果類型？ –

如何使用struts2中的ajax將數據從動作類獲取到jsp？

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