Java Spring MVC 上传下载文件配置及controller方法详解

<bean class="org.springframework.web.servlet.mvc.annotation.annotationmethodhandleradapter"> 
<property name="messageconverters"> 
<list> 
<!--配置下载返回类型-->
<bean class="org.springframework.http.converter.bytearrayhttpmessageconverter"/> 
<bean class="org.springframework.http.converter.stringhttpmessageconverter"> 
<!--配置编码方式-->
<property name="supportedmediatypes" value="application/json; charset=utf-8" /> 
</bean> 
</list> 
</property> 
</bean>

@requestmapping("/file/{name.rp}")
public responseentity<byte[]> filedownload(@pathvariable("name.rp")string name, httpservletrequest request,httpservletresponse response) {
// @pathvariable string name,
// @requestparam("name")string name,
// system.out.println("<name>"+name);
// system.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
responseentity<byte[]> re = null;
try {
/**
* css,js,json,gif,png,bmp,jpg,ico,doc,docx,xls,xlsx,txt,swf,pdf
* **/
//下载防止静态加载干扰
feelutile f=new feelutile();
name=f.getfileformat(name);
string pathstring="c:\\tempdirectory\\"+name; 
file file=new file(pathstring);
httpheaders headers=new httpheaders();
//string filename=urlencoder.encode(name, "utf-8");//为了解决中文名称乱码问题 
string filename=new string(name.getbytes("utf-8"),"utf-8");
byte[] by=fileutils.readfiletobytearray(file);
headers.setcontenttype(mediatype.application_octet_stream);
//urlencoder.encode(filename, "utf-8")
headers.setcontentdispositionformdata("attachment",filename);
headers.setcontentlength(by.length);
re=new responseentity<byte[]>(by, headers, httpstatus.created);
} catch (exception e) {
e.printstacktrace();
try {
request.getrequestdispatcher("/error/404.jsp").forward(request, response);
} catch (servletexception e1) {
// todo auto-generated catch block
e1.printstacktrace();
} catch (ioexception e1) {
// todo auto-generated catch block
e1.printstacktrace();
}
}
return re;
}

<!--4.文件上传 配置 file upload -->
<bean id="multipartresolver"
class="org.springframework.web.multipart.commons.commonsmultipartresolver">
<property name="defaultencoding">
<value>utf-8</value>
</property>
<property name="maxuploadsize">
<value>1048576000</value>
</property>
<property name="maxinmemorysize">
<value>40960</value>
</property>
</bean>

@requestmapping(value="/upload", method = requestmethod.post)
@responsebody
public json upload(doc doc, @requestparam("uploadfile") commonsmultipartfile file) {
json j = new json();
try {
string realpath = this.servletcontext.getrealpath("/upload"); 
string uploadfilefilename = file.getoriginalfilename(); 
string uploadfilefilenamewithoutspace = uploadfilefilename.replaceall(" ", ""); 
string filetype = uploadfilefilenamewithoutspace.substring(uploadfilefilenamewithoutspace.lastindexof("."));
file targetfile = new file(realpath+file.separator, uploadfilefilenamewithoutspace);
if (targetfile.exists()) {
targetfile.delete();
}
file.getfileitem().write(targetfile); 
docservice.upload(doc,uploadfilefilenamewithoutspace);
j.setsuccess(true);
j.setmsg("upload manual successfully");
}catch (exception e) {
logger.error(exceptionutil.getexceptionmessage(e));
j.setmsg("upload manual unsuccessfully");
}
return j;
}