commons-fileload图片文件上传工具 ， servlet文件图片上传案列

本案列是java  maven工程小项目，提供个大家学习！

1.在pom.xml文件中导入依赖：

<!--文件上传依赖-->
<dependency>
  <groupId>commons-fileupload</groupId>
  <artifactId>commons-fileupload</artifactId>
  <version>1.4</version>
</dependency>

<!--String社区 jackson-->
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.11.0</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
  <version>2.11.0</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.11.0</version>
</dependency>

1. 编写图片上传工具，ApachFileUploadUtil ：import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;

/**
 * 文件上传，批量上传文件工具
 * @author: boat
 */
public class ApachFileUploadUtil {
    private static DiskFileItemFactory fileItemFactory = new DiskFileItemFactory();

    /**
     * 上传功能
     * @param request
     * @param filePath
     * @return 路径集合
     */
    public static  List<String> fileUpload(HttpServletRequest request,String filePath){
        ServletFileUpload servletFileUpload = new ServletFileUpload(fileItemFactory);
        List<String> list = new ArrayList<>();
        try {
            List<FileItem> fileItems = servletFileUpload.parseRequest(request);
            for (FileItem item : fileItems){
                String fieldName = item.getFieldName();
                if(!item.isFormField()){ //判断是否是文件项
                    //获取原文件名
                    String name = item.getName();

                    InputStream in = item.getInputStream();

                    String path = getPath(filePath, name);
                    OutputStream out = new FileOutputStream(path);
                    byte[] b = new byte[1024];
                    int len = 0;
                    while((len = in.read(b)) != -1){
                        out.write(b,0,len);
                    }
                    out.close();
                    in.close();

                    //添加文件路径
                    list.add(path);
                }
                item.delete();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

    /**
     * 随机字符串
     * @param fileName
     * @return String
     */
    public static String radomFileName(String fileName){
        int index = fileName.lastIndexOf(".");
        String suffix = fileName.substring(index);
        String newfileName = UUID.randomUUID().toString().replace("-", "");
        return (newfileName + suffix);
    }

    /**
     * 随机文件路径
     * @return String
     */
    public static String radomFilePath(){
        String format = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        return format.replace("-","");
    }

    /**
     * 返回指定的文件路径
     * @param path
     * @param fileName
     * @return String
     */
    public static String getPath(String path,String fileName){

        String newPath = path + "\\"+ radomFilePath();
        File photoFileDir = new File(newPath);

        if(!photoFileDir.exists()){ // 如果路径不存在，就创建路径
            photoFileDir.mkdirs();
        }

        return (newPath + "\\" + radomFileName(fileName));
    }

}

2.在servlet类中service调用图片上传工具类：

import com.boat.utils.ApachFileUploadUtil;
import com.fasterxml.jackson.databind.ObjectMapper;
import javax.servlet.ServletContext;
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 java.io.IOException;
import java.util.List;

@WebServlet("/file")
public class FileUploadServlet extends HttpServlet {

    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html; charset=utf-8");
        ServletContext servletContext = req.getServletContext();
        String realPath = servletContext.getRealPath("/img");

        List<String> strings = ApachFileUploadUtil.fileUpload(req, realPath);
        String json = new ObjectMapper().writeValueAsString(strings);

        resp.getWriter().println("{status:1,data:"+json+",message:'上传成功'}");
    }

    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doPost(req,resp);
    }

}

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