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本篇介绍了java实现文件保存到本地的方法，具体代码如下：
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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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