使用httpclient实现上传下载（javaWeb系统数据传输http实现）

目的：项目被拆分为两个javaWeb项目，实现项目之间数据传输以及上传、下载功能。

前台展示项目A，后台提供数据支持项目B

题外话：

两个javaWeb传输之间使用json比较方便，如果恰好使用SpringMVC，配置相关JSON转换工具(功能很强大非常好用)，在

@Controller层

加上@ResponseBody自动将返回值转化成json格式

<mvc:annotation-driven content-negotiation-manager="contentNegotiationManager">
<mvc:message-converters register-defaults="true">
<!-- 将StringHttpMessageConverter的默认编码设为UTF-8 -->
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8" />
</bean>
<!-- 将Jackson2HttpMessageConverter的默认格式化输出设为true -->
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="prettyPrint" value="true"/>
<property name="objectMapper">
<bean class="com.fasterxml.jackson.databind.ObjectMapper">
<property name="dateFormat">
<bean class="java.text.SimpleDateFormat">
<constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />
</bean>
</property>
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>

<!-- REST中根据URL后缀自动判定Content-Type及相应的View -->
<bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="ignoreAcceptHeader" value="true" />
<property name="defaultContentType" value="application/json" />
<property name="mediaTypes" >
<value>
json=application/json
xml=application/xml
</value>
</property>
</bean>

<!-- jsp配置视图解析 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/page/"/>
<property name="suffix" value=".jsp"/>
</bean>

进入正题：

上传代码： A调用上传工具类(最头疼的问题就是文件名乱码)

/**
     * 文件上传
     * @param is
     * @param fileName
     * @param url
     * @return
     */
    public static String uploadFile(InputStream is ,String fileName ,String url){
        String result = null;
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost(url);
        //防止文件名乱码
        InputStreamBody fileis = new InputStreamBody(is,ContentType.create("text/plain", Consts.UTF_8),fileName);
        HttpEntity reqEntity = null;
        HttpResponse responses = null;
        try {
            //BROWSER_COMPATIBLE 设置浏览器为兼容模式  随便设置编码防止乱码
            reqEntity = MultipartEntityBuilder.create().setMode(HttpMultipartMode.BROWSER_COMPATIBLE)
                    .addPart("Filedata", fileis).setCharset(CharsetUtils.get("utf-8")).build();
            httppost.setEntity(reqEntity);
            // 如果需要登陆加上sessionId
            httppost.addHeader(new BasicHeader("Cookie", "sessionId=" + clientUser.getSessionId()));
            responses = httpclient.execute(httppost);
            HttpEntity entity = responses.getEntity();
            if(entity != null){
                result = EntityUtils.toString(entity, Charset.forName("utf-8"));
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        return result;
    }

B使用SpringMvc方便得到传入的文件。

@RequestMapping(value="/upload",method=RequestMethod.POST)
@ResponseBo
f0ea
dy
public ModelMap upload(MultipartRequest request){

ModelMap model = new ModelMap();
MultipartFile file = request.getFile("Filedata");

String realName= null;
realName = new Date().getTime() + "_" +file.getOriginalFilename();

File targetFile = new File(UPLOAD_PATH, realName);
if (!targetFile.exists()) {
targetFile.mkdirs();
}
              //生成文件<pre name="code" class="java">               file.transferTo(targetFile);

return model;}

------------------------------------------------------------------------------------

下载

A调用下载  上代码

/**
* 文件下载
* @param url
* @param fileName
* @return
*/
public static InputStream fileDownload(String url,String fileName){
CloseableHttpClient  httpclient = new HttpUtils().buildHttpClient();
HttpPost httppost = new HttpPost(url);
StringEntity sEntity = new StringEntity(fileName, Charset.forName("utf-8"));
//		BasicNameValuePair basicNameValuePair = new BasicNameValuePair("fileName",fileName);
//		List<NameValuePair> list = new ArrayList<NameValuePair>();
//		list.add(basicNameValuePair);
//		UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(list, Charset.forName("utf-8"));
//   	httppost.setEntity(formEntity);
httppost.setEntity(sEntity);

httppost.addHeader(new BasicHeader("Cookie", "sessionId=" + clientUser.getSessionId()));
httppost.addHeader("Content-Type", "application/xml;charset=utf-8");
try {
CloseableHttpResponse responses = httpclient.execute(httppost);
HttpEntity entity = responses.getEntity();
InputStream content = entity.getContent();
return content;
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return null;
}

B服务端代码：屏蔽了response.set部分代码，不然会报一个奇怪的错，无法解决。

    @RequestMapping(value="/fileDownload",method=RequestMethod.POST)
    @ResponseBody
    public void fileDownload(HttpServletRequest request,HttpServletResponse response){
// getXmlContent获取流传输的文件名,当然也可以使用request.getAttribute获取文件名，需要httpclient做一些设置
        String fileName = getXmlContent(request).trim();
        System.out.println("开始下载文件....."  + fileName);
        try {
            File file = new File(DOWNLOAD_PATH + fileName);
            if(!file.exists() ||  !file.isFile()){
                System.out.println("文件不存在。。" + fileName );
                return;
            }
            //response.setCharacterEncoding("utf-8");
            //response.setContentType("multipart/form-data");
            //response.setHeader("Content-Disposition", "attachment;fileName=" + fileName);
            InputStream inputStream = new FileInputStream(file);
            OutputStream os = response.getOutputStream();
            byte[] b = new byte[1024];
            int length;
            while ((length = inputStream.read(b)) > 0) {
                os.write(b, 0, length);
            }
//            Long filelength = file.length();
//            byte[] b = new byte[filelength.intValue()];
//            inputStream.read(b);
//            os.write(b, 0, filelength.intValue());
            inputStream.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

如果服务端A的下载文件为中文名，需要转码

try {
fileName =  new String(fileName.getBytes("iso8859-1"),"UTF-8");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}

--------------------------------------------------------------------------------无敌大冬瓜-------------------------------------------------------------------------------------------------------------------------

贴段代码

import java.io.IOException;
import java.nio.charset.Charset;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;

import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.config.ConnectionConfig;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.config.SocketConfig;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.LayeredConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContexts;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class HttpUtils {

public static String defaultEncoding= "utf-8";

public static void main(String[] args) {
HttpUtils httpUtils = new HttpUtils();
//String result = httpUtils.postRequest("https://zeustracker.abuse.ch/monitor.php?filter=all");
String result = httpUtils.getRequest("https://hgcg.customs.gov.cn/hgcg/cggg/004001/MoreInfo.aspx?CategoryNum=004001");
//String result = httpUtils.getRequest("http://www.baidu.com");
System.out.println("result="+result);
}

/**
* post方式发送xml数据
* @param url
* @param xmlData
* @return
*/
public String sendXMLDataByPost(String url, String xmlData, String sessionId){
Map<String, String> headersMap = new HashMap<String, String>();
headersMap.put("Content-Type", "application/xml;charset=utf-8");
if(StringUtils.isNotBlank(sessionId)){
headersMap.put("Cookie", "sessionId="+sessionId);
}
return this.postRequest(url, headersMap, xmlData);
}

/**
* 发送http post请求，并返回响应实体
* @param url 请求地址
* @return url响应实体
*/
public String postRequest(String url){
return postRequest(url, null, "");
}

/**
* 发送http post请求，并返回响应实体
* @param url 请求的url
* @param headersMap 请求需要添加的请求头
* @return url响应实体
*/
public String postRequest(String url, Map<String, String> headersMap){
return postRequest(url, headersMap, "");
}

/**
* 发送http post请求，并返回响应实体
* @param url 访问的url
* @param headersMap 请求需要添加的请求头
* @param paramsMap 请求的参数
* @return
*/
public String postRequest(String url, Map<String, String> headersMap, Map<String, String> paramsMap){
String result = null;
CloseableHttpClient httpClient = buildHttpClient();
HttpPost httpPost = new HttpPost(url);
if(null != headersMap && headersMap.size() > 0){
for (Entry<String, String> entry : headersMap.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
httpPost.addHeader(new BasicHeader(key, value));
}
}
List<NameValuePair> list = new ArrayList<NameValuePair>(paramsMap.size());
if(null != paramsMap && paramsMap.size() > 0){
for (Entry<String, String> entry : paramsMap.entrySet()) {
list.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
}
try{
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(list, Charset.forName(defaultEncoding));
httpPost.setEntity(formEntity);
CloseableHttpResponse response = httpClient.execute(httpPost);
try{
HttpEntity entity = response.getEntity();
if(entity != null){
result = EntityUtils.toString(entity, Charset.forName(defaultEncoding));
}
}finally{
response.close();
}
}catch(Exception ex){
ex.printStackTrace();
}finally{
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}

return result;
}

/**
* 发送http post请求，并返回响应实体
* @param url 访问的url
* @param headersMap 请求需要添加的请求头
* @param paramsMap 请求实体内容
* @return
*/
public String postRequest(String url, Map<String, String> headersMap, String content){
String result = null;
CloseableHttpClient httpClient = buildHttpClient();
HttpPost httpPost = new HttpPost(url);
if(null != headersMap && headersMap.size() > 0){
for (Entry<String, String> entry : headersMap.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
httpPost.addHeader(new BasicHeader(key, value));
}
}
try{
if(StringUtils.isNotBlank(content)){
httpPost.setEntity(new StringEntity(content, Charset.forName(defaultEncoding)));
}
CloseableHttpResponse response = httpClient.execute(httpPost);
try{
HttpEntity entity = response.getEntity();
if(entity != null){
result = EntityUtils.toString(entity, Charset.forName(defaultEncoding));
}
}finally{
response.close();
}
}catch(Exception ex){
ex.printStackTrace();
}finally{
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}

return result;
}

/**
* 发送http get请求
* @param url 请求url
* @return url返回内容
*/
public String getRequest(String url){
return getRequest(url, "");
}

/**
* 发送http get请求
*/
public String getRequest(String url, String sessionId) {
Map<String, String> headersMap = new HashMap<String, String>();
headersMap.put("Content-Type", "application/xml;charset=utf-8");
if(StringUtils.isNotBlank(sessionId)){
headersMap.put("Cookie", "sessionId="+sessionId);
}
return getRequest(url, headersMap);
}

/**
* 发送http get请求
* @param url 请求的url
* @param headersMap 请求头
* @return
*/
public String getRequest(String url, Map<String, String> headersMap){
String result = null;
CloseableHttpClient httpClient = buildHttpClient();
try{

HttpGet httpGet = new HttpGet(url);
if(null != headersMap && headersMap.size() > 0){
for (Entry<String, String> entry : headersMap.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
httpGet.addHeader(new BasicHeader(key, value));
}
}
CloseableHttpResponse response = httpClient.execute(httpGet);
try{
HttpEntity entity = response.getEntity();
if(null != entity){
result = EntityUtils.toString(entity, defaultEncoding);
}
}finally{
response.close();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return result;
}

/**
* 创建httpclient
* @return
*/
public CloseableHttpClient buildHttpClient() {
try {
RegistryBuilder<ConnectionSocketFactory> builder = RegistryBuilder.create();
ConnectionSocketFactory factory = new PlainConnectionSocketFactory();
builder.register("http", factory);
KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
SSLContext context = SSLContexts.custom().useTLS().loadTrustMaterial(trustStore, new TrustStrategy() {
@Override
public boolean isTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
return true;
}
}).build();
//LayeredConnectionSocketFactory sslFactory = new SSLConnectionSocketFactory(context, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
LayeredConnectionSocketFactory sslFactory = new SSLConnectionSocketFactory(context, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER){
protected void prepareSocket(SSLSocket socket) throws IOException {
// Workaround to use different order of CipherSuites used by Java6 in order
// to avoid the the problem of java7 "Could not generate DH keypair"
String[] enabledCipherSuites = socket.getEnabledCipherSuites();

// but to avoid hardcoding a new list, we just remove the entries
// which cause the exception (via TrialAndError)
List<String> asList = new ArrayList<String>(Arrays.asList(enabledCipherSuites));

// we identified the following entries causeing the problems
// "Could not generate DH keypair"
// and "Caused by: java.security.InvalidAlgorithmParameterException: Prime size must be multiple of 64, and can only range from 512 to 1024 (inclusive)"
asList.remove("TLS_DHE_RSA_WITH_AES_128_CBC_SHA");
asList.remove("SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA");
asList.remove("TLS_DHE_RSA_WITH_AES_256_CBC_SHA");
String[] array = asList.toArray(new String[0]);
socket.setEnabledCipherSuites(array);
};
};

builder.register("https", sslFactory);
Registry<ConnectionSocketFactory> registry = builder.build();

PoolingHttpClientConnectionManager manager = new PoolingHttpClientConnectionManager(registry);
ConnectionConfig connConfig = ConnectionConfig.custom().setCharset(Charset.forName(defaultEncoding)).build();
SocketConfig socketConfig = SocketConfig.custom().setSoTimeout(100000).build();
manager.setDefaultConnectionConfig(connConfig);
manager.setDefaultSocketConfig(socketConfig);
return HttpClientBuilder.create().setConnectionManager(manager).build();
} catch (KeyStoreException e) {
e.printStackTrace();
} catch (KeyManagementException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}
}