ajax 请求后台

柔情只为你懂 2021-11-16 22:50 329阅读 0赞

先简单的记录一下 ajax 的用法

HttpServletResponse response = ServletActionContext.getResponse();
    response.setCharacterEncoding("utf-8");
    PrintWriter out;

前台 ：

$.ajax({ 
    			url:'<%=basePath%>AutoCodeSession',//这里是你的action或者servlert的路径地址 
    			type:'post', //数据发送方式 
    			dataType:'json', //接受数据格式 (这里有很多,常用的有html,xml,js,json) 
    			//data:'', //要传递的数据 
    			data:'username='+$("#username").val()+'&password='+$("#password").val(), //要传递的数据 
    			error: function(msg){ //失败 
    			alert('Error loading document');
    		 	alert(msg.responseText);
    			}, 
    			success: function(msg){ //成功 
    	                alert('username='+$("#username").val()+'&password='+$("#password").val());
     			alert(msg.url);//根据后台返回值前台可以获取值
    			}
    			});

后台：

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    		System.out.println("dopost------");
    		response.setContentType("text ml;charset=utf-8");  
    		// 设置浏览器禁用缓存
    		response.setHeader("pragma", "no-cache");
    		response.setHeader("cache-control", "no-cache");
    		HttpSession session = request.getSession(true);
    		String orgHref = (String) session.getAttribute("orgHref");
    		System.out.println("wangzhi :====="+orgHref);
     		String jsonString = "{\"success\":\"true\",\"url\":\""+orgHref+"\"}";//这里设定 返回到前台的值  前台可以用 msg.url来获取
     		String userName = request.getParameter("username");
    		String passWord = request.getParameter("password");
    
    		System.out.println("suername ----"+userName);
     		PrintWriter out;
    		try {
    		out = response.getWriter();
    		out.print(jsonString);
    		out.flush();
    		out.close();
    		} catch (IOException e) {
    		e.printStackTrace();
    		}
    	}
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		this.doPost(request, response);
    	}

后台 struts

package cn.lin.action.check;
    
    import java.io.File;
    import java.io.IOException;
    import java.sql.Timestamp;
    import java.util.Date;
    
    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.lang.StringUtils;
    import org.apache.struts2.ServletActionContext;
    import org.apache.struts2.interceptor.validation.SkipValidation;
    import org.springframework.context.ApplicationContext;
    
    import com.opensymphony.xwork2.ActionContext;
    
    import cn.fulong.common.web.action.BaseAction;
    import cn.fulong.growth.entity.GrowthDmApplyInfo;
    import cn.fulong.growth.service.DirecApplyService;
    
    /**
     *  这里写的是一个上传文件的验证
     *
     */
    public class DirecapplyAction  extends BaseAction{
    	
    
    	 
    	/**
    	 * 页面提示信息
    	 */
    	private String msg;
    	 
    	
    	 
    	private File files;
    	
    	 
    	private String filesFileName;
    	
    	private String filesContentType ;
    	
    	
    	 
    	public String getMsg() {
    		return msg;
    	}
    	public void setMsg(String msg) {
    		this.msg = msg;
    	}
    	 
    	public File getFiles() {
    		return files;
    	}
    	public void setFiles(File files) {
    		this.files = files;
    	}
    	public String getFilesFileName() {
    		return filesFileName;
    	}
    	public void setFilesFileName(String filesFileName) {
    		this.filesFileName = filesFileName;
    	}
    	public String getFilesContentType() {
    		return filesContentType;
    	}
    	public void setFilesContentType(String filesContentType) {
    		this.filesContentType = filesContentType;
    	}
    	 
    	public String checkFile() throws IOException{
    		if(null == files){
    			/**若文件为空返回""**/
    			msg= "宣传材料不能为空";
    		}else{
    			// 判断数据是否正确
    			// 文件后缀名
    			int index = StringUtils.lastIndexOf(filesFileName, '.');
    			if (index == -1) {
    				msg= "文件类型错误！";
    			}
    			/**获取文件后缀名**/
    			String extFileName = StringUtils.substring(filesFileName, index + 1);
    			String forbitName = "doc-docx";
    			String[] forbitNames = forbitName.split("-");
    			for(int i= 0 ;i<forbitNames.length ; i++){
    				 if(extFileName.equalsIgnoreCase(forbitNames[i])){
    					 msg= "请上传正确的附件,附件不能类型不能为"+forbitNames[i];
    					 break;
    				 }
    			 }
    			
    		}
    		HttpServletResponse response = (HttpServletResponse)ActionContext.getContext().get(ServletActionContext.HTTP_RESPONSE);  
    		response.getWriter().println(new String (msg.getBytes("ISO8859_1"), "utf-8"));//利用这样的写法 来获取后台返回值
    		return null;
    	}
    }