java网络编程代码(java中网络编程)

今天给各位分享java网络编程代码的知识，其中也会对java中网络编程进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

本文目录一览：

• 1、如何利用java网络编程,发送multipart/form

如何利用java网络编程,发送multipart/form

public class RandNumber {

private String uuid;

private Integer number;

public String getUuid() {

return uuid;

}

public void setUuid(String uuid) {

this.uuid = uuid;

}

public Integer getNumber() {

return number;

}

public void setNumber(Integer number) {

this.number = number;

}

@Override

public String toString() {

return number + " " + uuid;

}

public static class Builder {

private RandNumber number;

public Builder() {

number = new RandNumber();

}

public Builder randomlyGenerate() {

Random random = new Random();

number.setNumber(random.nextInt(100));

number.setUuid(UUID.randomUUID().toString());

return this;

}

public Builder withNumber(int num) {

number.setNumber(num);

return this;

}

public Builder withUuid(String uuid) {

number.setUuid(uuid);

return this;

}

public RandNumber build() {

return number;

}

}

}

在这个类中，我们除了定义类的基本信息，还添加了一个Builder类。通过这个Builder类，我们可以很方便的生成RandNumber类。Builder类在我们的数据类的Constructor很复杂的时候，非常有用，可以使我们的代码更具可读性。

有了这个肆隐简单的数据类，我们继续定义一个简单的业务类RandomNumberGenerator，它继承了IRandomNumberGenerator接口：

public interface IRandomNumberGenerator {

RandNumber getRandomNumber();

RandNumber[] getRandomNumbers(int num);

void submitRandomNumber(RandNumber randNumber);

void submitRandomNumbers(RandNumber[] randNumbers);

}

同时，我们还定义了一个RandomNumberSerializer类，它可以对我们的数据类进梁雹慎行JSON Serialization操作，我们的服务橡敬端和客户端都将使用它进行通信：

public interface IRandomNumberSerializer {

String serializeRandomNumber(RandNumber number);

RandNumber deserializeRandomNumber(String input);

void serializeRandomNumber(RandNumber number, OutputStream stream);

RandNumber deserializeRandomNumber(InputStream stream);

String getContentType();

}

RandomNumberSerializer内部使用了Gson包来进行序列化操作。在上面的接口中，我们提供了对String和Stream的两种方法，这样，当我们进行HTTP通信的时候，我们可以直接对Network Stream进行操作。

有了上面的这些类，我们的Servlet服务端代码就很简单了：

@Controller

public class MultiPartRequestServlet {

private static Logger log = Logger.getLogger(MultiPartRequestServlet.class);

@Autowired

private IRandomNumberSerializer randomNumberSerializer;

@Autowired

private IRandomNumberGenerator randomNumberGenerator;

@RequestMapping(value="/get-multi", method = RequestMethod.GET)

public void getMultiple(

@RequestHeader("MAX_NUM_NUMS") int maxCount,

HttpServletRequest request,

HttpServletResponse response,

ServletOutputStream outputStream) throws Exception {

log.info("multi part get is called");

response.setStatus(HttpServletResponse.SC_OK);

String boundary = UUID.randomUUID().toString();

response.setContentType("multipart/x-mixed-replace;boundary=" + boundary);

RandNumber[] numbers = randomNumberGenerator.getRandomNumbers(maxCount);

for (int index = 0; index maxCount; index++) {

outputStream.println("--" + boundary);

outputStream.println("Content-Type: " + randomNumberSerializer.getContentType());

outputStream.println();

outputStream.println(randomNumberSerializer.serializeRandomNumber(numbers[index]));

outputStream.println();

}

outputStream.println("--" + boundary + "--");

outputStream.flush();

outputStream.close();

}

@RequestMapping(value="/submit-multi", method = RequestMethod.POST)

public void submitMultiple(HttpServletRequest request, HttpServletResponse response) throws Exception {

log.info("multi part submit is called");

if (!request.getContentType().startsWith("multipart/form-data")) {

response.setStatus(HttpServletResponse.SC_BAD_REQUEST);

} else {

request.setAttribute("org.eclipse.multipartConfig",

new MultipartConfigElement(System.getProperty("java.io.tmpdir")));

CollectionPart parts = request.getParts();

for (Part part : parts) {

RandNumber number = randomNumberSerializer.deserializeRandomNumber(part.getInputStream());

randomNumberGenerator.submitRandomNumber(number);

}

response.setStatus(HttpServletResponse.SC_OK);

}

}

@RequestMapping(value="/get-one", method = RequestMethod.GET)

public void getOne(HttpServletRequest request, HttpServletResponse response, OutputStream outputStream) throws Exception {

log.info("get is called");

RandNumber number = randomNumberGenerator.getRandomNumber();

response.setStatus(HttpServletResponse.SC_OK);

response.setContentType(randomNumberSerializer.getContentType());

randomNumberSerializer.serializeRandomNumber(number, outputStream);

outputStream.flush();

outputStream.close();

}

@RequestMapping(value="/submit-one", method = RequestMethod.POST)

public void submitOne(HttpServletRequest request, HttpServletResponse response) throws Exception {

log.info("submit is called");

RandNumber number = randomNumberSerializer.deserializeRandomNumber(request.getInputStream());

randomNumberGenerator.submitRandomNumber(number);

response.setStatus(HttpServletResponse.SC_OK);

}

}

在上面的代码中，getOne和submitOne很简单，这里我们主要讨论getMultiple和submitMultiple。在getMultiple中，我们直接操作outputStream来实现Multipart协议。而在submitMultiple中，我们则通过Servlet 3.0的getParts方法来直接获得每一个Part。需要注意的是，getParts是在Servlet 3.0中才新添加的方法，在我们部署服务的时候，我们要部署在支持Servlet 3.0的container里（在这里我对Tomcat7和Jetty8进行了测试）。同时，我们在调用getParts之前，我们对request添加了一个attribute，这个attribute只在部署在Jetty时需要。

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