java实现文件保存到本地的方法

本篇介绍了java实现文件保存到本地的方法，具体代码如下：

private void savepic(inputstream inputstream, string filename) {

    outputstream os = null;
    try {
      string path = "d:\\testfile\\";
      // 2、保存到临时文件
      // 1k的数据缓冲
      byte[] bs = new byte[1024];
      // 读取到的数据长度
      int len;
      // 输出的文件流保存到本地文件

      file tempfile = new file(path);
      if (!tempfile.exists()) {
        tempfile.mkdirs();
      }
      os = new fileoutputstream(tempfile.getpath() + file.separator + filename);
      // 开始读取
      while ((len = inputstream.read(bs)) != -1) {
        os.write(bs, 0, len);
      }

    } catch (ioexception e) {
      e.printstacktrace();
    } catch (exception e) {
      e.printstacktrace();
    } finally {
      // 完毕，关闭所有链接
      try {
        os.close();
        inputstream.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
  }

文件保存方法.

附：

package com.ebways.web.upload.controller;

import java.io.*;
import java.text.simpledateformat;
import java.util.date;
import java.util.hashmap;
import java.util.map;

import com.ebways.web.base.basecontroller;
import org.springframework.stereotype.controller;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.requestparam;
import org.springframework.web.bind.annotation.responsebody;
import com.ebways.web.upload.url.uploadurl;
import org.springframework.web.multipart.multipartfile;

import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;

@controller
@requestmapping(value = uploadurl.mode_name)
public class uploadcontroller extends basecontroller {

  @requestmapping(value = uploadurl.image_upload)
  @responsebody
  public string uploadfile(multipartfile file, httpservletrequest request, httpservletresponse response) throws illegalargumentexception, exception {
    // 参数列表
    map<string, object> map = new hashmap<>();
    map.put("file", file);
    savepic(file.getinputstream(), file.getoriginalfilename());

    //请求接口
    string apireturnstr = "";//apihttprequest(map, api_host_url + "/image/upload");

    return apireturnstr;
  }

  private void savepic(inputstream inputstream, string filename) {

    outputstream os = null;
    try {
      string path = "d:\\testfile\\";
      // 2、保存到临时文件
      // 1k的数据缓冲
      byte[] bs = new byte[1024];
      // 读取到的数据长度
      int len;
      // 输出的文件流保存到本地文件

      file tempfile = new file(path);
      if (!tempfile.exists()) {
        tempfile.mkdirs();
      }
      os = new fileoutputstream(tempfile.getpath() + file.separator + filename);
      // 开始读取
      while ((len = inputstream.read(bs)) != -1) {
        os.write(bs, 0, len);
      }

    } catch (ioexception e) {
      e.printstacktrace();
    } catch (exception e) {
      e.printstacktrace();
    } finally {
      // 完毕，关闭所有链接
      try {
        os.close();
        inputstream.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
  }

  /**
   * <p class="detail">
   * 功能：公共action
   * </p>
   *
   * @date 2016年9月8日
   * @author wangsheng
   */
  private string allowsuffix = "jpg,png,gif,jpeg";//允许文件格式
  private long allowsize = 2l;//允许文件大小
  private string filename;
  private string[] filenames;

  public string getallowsuffix() {
    return allowsuffix;
  }

  public void setallowsuffix(string allowsuffix) {
    this.allowsuffix = allowsuffix;
  }

  public long getallowsize() {
    return allowsize * 1024 * 1024;
  }

  public void setallowsize(long allowsize) {
    this.allowsize = allowsize;
  }

  public string getfilename() {
    return filename;
  }

  public void setfilename(string filename) {
    this.filename = filename;
  }

  public string[] getfilenames() {
    return filenames;
  }

  public void setfilenames(string[] filenames) {
    this.filenames = filenames;
  }


  /**
   * <p class="detail">
   * 功能：重新命名文件
   * </p>
   *
   * @return
   * @author wangsheng
   * @date 2016年9月8日
   */
  private string getfilenamenew() {
    simpledateformat fmt = new simpledateformat("yyyymmddhhmmsssss");
    return fmt.format(new date());
  }

  /**
   * <p class="detail">
   * 功能：文件上传
   * </p>
   *
   * @param files
   * @param destdir
   * @throws exception
   * @author wangsheng
   * @date 2014年9月25日
   */
  public void uploads(multipartfile[] files, string destdir, httpservletrequest request) throws exception {
    string path = request.getcontextpath();
    string basepath = request.getscheme() + "://" + request.getservername() + ":" + request.getserverport() + path;
    try {
      filenames = new string[files.length];
      int index = 0;
      for (multipartfile file : files) {
        string suffix = file.getoriginalfilename().substring(file.getoriginalfilename().lastindexof(".") + 1);
        int length = getallowsuffix().indexof(suffix);
        if (length == -1) {
          throw new exception("请上传允许格式的文件");
        }
        if (file.getsize() > getallowsize()) {
          throw new exception("您上传的文件大小已经超出范围");
        }
        string realpath = request.getsession().getservletcontext().getrealpath("/");
        file destfile = new file(realpath + destdir);
        if (!destfile.exists()) {
          destfile.mkdirs();
        }
        string filenamenew = getfilenamenew() + "." + suffix;//
        file f = new file(destfile.getabsolutefile() + "\\" + filenamenew);
        file.transferto(f);
        f.createnewfile();
        filenames[index++] = basepath + destdir + filenamenew;
      }
    } catch (exception e) {
      throw e;
    }
  }

  /**
   *功能：文件上传
   *
   * @param file
   * @param destdir
   * @throws exception
   * @author wangsheng
   * @date 2016年9月8日
   */
  public void upload(multipartfile file, string destdir, httpservletrequest request) throws exception {
    string path = request.getcontextpath();
    string basepath = request.getscheme() + "://" + request.getservername() + ":" + request.getserverport() + path;
    try {
      string suffix = file.getoriginalfilename().substring(file.getoriginalfilename().lastindexof(".") + 1);
      int length = getallowsuffix().indexof(suffix);
      if (length == -1) {
        throw new exception("请上传允许格式的文件");
      }
      if (file.getsize() > getallowsize()) {
        throw new exception("您上传的文件大小已经超出范围");
      }

      string realpath = request.getsession().getservletcontext().getrealpath("/");
      file destfile = new file(realpath + destdir);
      if (!destfile.exists()) {
        destfile.mkdirs();
      }
      string filenamenew = getfilenamenew() + "." + suffix;
      file f = new file(destfile.getabsolutefile() + "/" + filenamenew);
      file.transferto(f);
      f.createnewfile();
      filename = basepath + destdir + filenamenew;
    } catch (exception e) {
      throw e;
    }
  }

}

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