vue form表单post请求结合Servlet实现文件上传功能

前端测试页面代码：

template>
     div>
      input tyPE="file" name="file" @change="change($event)">
     /div>
    /template>
    script>
 export default {
  created(){
       this.path = this.$route.query;
   for (let i in this.path) {
        this[i] = decodeURIcomponent(this.path[i]);
   }
  }
,  methods:{
   change(ev){
        let file = ev.target.files[0];
        let size = file.size;
        let name = file.name;
        if(size >
 314572800){
         this.$message.warning('上传文件不能超过300M');
         return;
    }
        let formData = new FormData();
    formData.append('file',file,name)    this.$axios.post('/JT3'+this.getddRecordDelete,formData,{
     headers:{
"Content-type":"multipart/form-data"}
    }
    ).then(data=>
{
         console.LOG(data);
    }
)   }
  }
 }
    /script>
    style scoped>
    /style>
    

后端servlet接收代码

package jt3.control.zygkh;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.List;
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import org.apache.COMmons.fileupload.FileITem;
     import org.apache.commons.fileupload.FileUploadException;
     import org.apache.commons.fileupload.disk.DiskFileitemFactory;
     import org.apache.commons.fileupload.servlet.ServletFileUpload;
    import jtacc.filter.JTKit;
    import jtacc.jtpub.DT;
 @WebServlet(urlPatterns = "/upfile/file") public class UploadServlet extends HttpServlet {
    	PRivate static final long serialVersionUID = 1L;
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		System.out.println(11);
    		this.doPost(request, response);
 }
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     	String uri="/u/file/"+DT.getFormatDate("yyyyMMdd")+"/";
     //定义路径 	String tmpPath=JTKit.getBaseDIR()+uri;
    //此处为个人项目路径，根据需求定义路径 	DiskFileItemFactory factory = new DiskFileItemFactory();
    		factory.setRepository(new File(tmpPath));
    //临时文件存储路径		ServletFileUpload fileUpload = new ServletFileUpload(factory);
    //核心操作对象		fileUpload.setHeaderEncoding("utf-8");
//防乱码		try {
    			//此处如果要实时强行转换则需要下载jar包（commons-fileupload-1.3.3.jar）			ListFileItem>
     list = fileUpload.parseRequest(request);
			for (FileItem fileItem : list) {
    				InputStream in = fileItem.getInputStream();
    				String filename = fileItem.getName();
				if (fileItem != null) {
    					System.out.println(filename);
    					int len = 0;
    					byte[] array = new byte[1024];
    					FileOutputStream fos = new FileOutputStream(tmpPath+filename);
					while((len = in.read(array))!=-1){
    //表示每次最多读1024个字节						fos.write(array,0,len);
    						fos.flush();
					}
    					fos.close();
    					in.close();
    					fileItem.delete();
    					response.setCharacterEncoding("UTF-8");
    					String realPath = uri+filename;
    					response.getWriter().append(realPath);
				}
			}
		}
 catch (FileUploadException e) {
    			// TODO Auto-generated catch block			e.printStackTrace();
		}
 }
 }
    

测试结果

补充：Servlet获取表单提交过来的数据

在Servlet的doPost方法：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
    

中获取表单数据，首先，为了防止出现中文乱码问题，需要给request设置编码为“UTF-8”：

request.setCharacterEncoding("utf-8");
    

获取单个字符串的方式：

pre style="font-family: 宋体;
     font-Size: 12pt;
     background-color: rgb(255, 255, 255);
    ">
    span style="font-size:18px;
     font-family: Arial, Helvetica, sans-serif;
     background-color: rgb(240, 240, 240);
    ">
    String username = request.getParameter("username");
    /span>
    

获取字符串数组的方式：

String[] favorites = request.getParameterValues("favorite");
    

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。如有错误或未考虑完全的地方，望不吝赐教。

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