我要评论最近在学习springboot，以下是最近学习整理的实现文件上传下载的java代码：
1、开发环境：
idea15+ maven+jdk1.8
2、新建一个maven工程：
3、工程框架
4、pom.xml文件依赖项
<project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelversion>4.0.0</modelversion> <groupid>springwebcontent</groupid> <artifactid>springwebcontent</artifactid> <packaging>war</packaging> <version>1.0-snapshot</version> <name>springwebcontent maven webapp</name> <url>http://maven.apache.org</url> <parent> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-parent</artifactid> <version>1.4.3.release</version> </parent> <dependencies> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-thymeleaf</artifactid> </dependency> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-devtools</artifactid> <optional>true</optional> </dependency> <dependency> <groupid>junit</groupid> <artifactid>junit</artifactid> <version>3.8.1</version> <scope>test</scope> </dependency> </dependencies> <properties> <java.version>1.8</java.version> </properties> <build> <finalname>springwebcontent</finalname> <plugins> <plugin> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-maven-plugin</artifactid> </plugin> </plugins> </build> </project>
5、application.java
import org.springframework.boot.springapplication;
import org.springframework.boot.autoconfigure.springbootapplication;
@springbootapplication
public class application {
public static void main(string[] args) {
springapplication.run(application.class, args);
}
}
6、filecontroller.java
import org.springframework.stereotype.controller;
import org.springframework.ui.model;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.requestmethod;
import org.springframework.web.bind.annotation.requestparam;
import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.web.bind.annotation.responsebody;
import org.springframework.web.multipart.multipartfile;
import org.springframework.web.multipart.multiparthttpservletrequest;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import java.io.*;
import java.util.list;
@controller
public class filecontroller {
@requestmapping("/greeting")
public string greeting(@requestparam(value="name", required=false, defaultvalue="world") string name, model model) {
model.addattribute("name", name);
return "greeting";
}
private static final logger logger = loggerfactory.getlogger(filecontroller.class);
//文件上传相关代码
@requestmapping(value = "upload")
@responsebody
public string upload(@requestparam("test") multipartfile file) {
if (file.isempty()) {
return "文件为空";
}
// 获取文件名
string filename = file.getoriginalfilename();
logger.info("上传的文件名为：" + filename);
// 获取文件的后缀名
string suffixname = filename.substring(filename.lastindexof("."));
logger.info("上传的后缀名为：" + suffixname);
// 文件上传后的路径
string filepath = "e://test//";
// 解决中文问题，liunx下中文路径，图片显示问题
// filename = uuid.randomuuid() + suffixname;
file dest = new file(filepath + filename);
// 检测是否存在目录
if (!dest.getparentfile().exists()) {
dest.getparentfile().mkdirs();
}
try {
file.transferto(dest);
return "上传成功";
} catch (illegalstateexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
return "上传失败";
}
//文件下载相关代码
@requestmapping("/download")
public string downloadfile(org.apache.catalina.servlet4preview.http.httpservletrequest request, httpservletresponse response){
string filename = "fileuploadtests.java";
if (filename != null) {
//当前是从该工程的web-inf//file//下获取文件(该目录可以在下面一行代码配置)然后下载到c:\\users\\downloads即本机的默认下载的目录
string realpath = request.getservletcontext().getrealpath(
"//web-inf//");
file file = new file(realpath, filename);
if (file.exists()) {
response.setcontenttype("application/force-download");// 设置强制下载不打开
response.addheader("content-disposition",
"attachment;filename=" + filename);// 设置文件名
byte[] buffer = new byte[1024];
fileinputstream fis = null;
bufferedinputstream bis = null;
try {
fis = new fileinputstream(file);
bis = new bufferedinputstream(fis);
outputstream os = response.getoutputstream();
int i = bis.read(buffer);
while (i != -1) {
os.write(buffer, 0, i);
i = bis.read(buffer);
}
system.out.println("success");
} catch (exception e) {
e.printstacktrace();
} finally {
if (bis != null) {
try {
bis.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
if (fis != null) {
try {
fis.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
}
}
}
return null;
}
//多文件上传
@requestmapping(value = "/batch/upload", method = requestmethod.post)
@responsebody
public string handlefileupload(httpservletrequest request) {
list<multipartfile> files = ((multiparthttpservletrequest) request)
.getfiles("file");
multipartfile file = null;
bufferedoutputstream stream = null;
for (int i = 0; i < files.size(); ++i) {
file = files.get(i);
if (!file.isempty()) {
try {
byte[] bytes = file.getbytes();
stream = new bufferedoutputstream(new fileoutputstream(
new file(file.getoriginalfilename())));
stream.write(bytes);
stream.close();
} catch (exception e) {
stream = null;
return "you failed to upload " + i + " => "
+ e.getmessage();
}
} else {
return "you failed to upload " + i
+ " because the file was empty.";
}
}
return "upload successful";
}
7、
<!doctype html> <html lang="en"> <head> <title>getting started: serving web content</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> </head> <body> <p>get your greeting <a href="/greeting" rel="external nofollow" >here</a></p> <form action="/upload" method="post" enctype="multipart/form-data"> 文件：<input type="file" name="test"/> <input type="submit" /> </form> <a href="/download" rel="external nofollow" >下载test</a> <p>多文件上传</p> <form method="post" enctype="multipart/form-data" action="/batch/upload"> <p>文件1：<input type="file" name="file" /></p> <p>文件2：<input type="file" name="file" /></p> <p><input type="submit" value="上传" /></p> </form> </html>
完整工程地址：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
您可能感兴趣的文章:
如您对本文有疑问或者有任何想说的，请点击进行留言回复，万千网友为您解惑！
网友评论