HTTP协议提交数据

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HTTP协议提交数据搭建服务器环境

当下最流行的开发环境：

Eclipse

当下最流行的J2EE框架集成体系：

2.1 Struts2，MVC

2.2 Hibernate3，ORM

3.3 Spring Framework，IoC、AOP

Get和post提交区别

get请求的参数是带在url后面

post的参数是以请求实体的形式

get请求是不安全的，以为可以被别人看见而且服务器对url的长度做了限制，

2k 4k 如果url过长，url就会被截取，

这样会导致数据的异常，post是安全。

HttpURLConnection

// 1 创建路径

// 2 通过路径拿到连接

// 3 设置请求方式

// 4 设置超时时间

// 5 判断是否连接成功 n

Get

// path 例： http://10.0.2.2:8081/xxxx/xxxx

StringBuilder sb = new StringBuilder(path);

// 拼接参数例：？Name=xxx&age =xxx

if(!params.isEmpty()){

sb.append("?");

for (Map.Entry<String, String> entry : params.entrySet()) {

String key = entry.getKey();

String value = entry.getValue();

sb.append(key).append("=").append(value);

sb.append("&");

}

sb.deleteCharAt(sb.length() - 1);

try {

URL url = new URL(sb.toString());

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

// 设置请求方式里面的参数一定要全大写

conn.setRequestMethod("GET");

conn.setReadTimeout(5000);

if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {

// -对web的反馈数据进行处理

InputStream is = conn.getInputStream();

ByteArrayOutputStream bos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while((len = is.read(buffer))!=-1)

{

bos.write(buffer, 0, len);

}

String data = bos.toString();

flag = data.equals("success")?true:false;

}

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Post

// post不需要在路径后面拼接参数

StringBuilder sb = new StringBuilder();

if(!params.isEmpty()){

for (Map.Entry<String, String> entry : params.entrySet()) {

String key = entry.getKey();

String value = entry.getValue();

sb.append(key).append("=").append(value);

sb.append("&");

}

sb.deleteCharAt(sb.length() - 1);

byte[] entity = sb.toString().getBytes();

try {

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("POST");

conn.setReadTimeout(5000);

//Content-Type: application/x-www-form-urlencoded

//Content-Length: 24

// 除了设置请求类型和请求超时时长外，一定要设置内容类型和内容长度

conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

conn.setRequestProperty("Content-Length", entity.length+"");

// 设置允许输出

// 输出请求实体例 name=xxx&age=xx

conn.setDoOutput(true);

OutputStream os = conn.getOutputStream();

os.write(entity);

if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {

InputStream is = conn.getInputStream();

ByteArrayOutputStream bos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while((len = is.read(buffer))!=-1)

{

bos.write(buffer, 0, len);

}

String data = bos.toString();

flag = data.equals("success")?true:false;

}

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

HttpClient

// 我们可以把它看作一个浏览器

特点：

1.需要引入第三方jar包(android内部提供)

2.基于HttpURLConnection的封装

3.能够满足复杂的需求（Cookit、Session）

4.基本操作简单

流程

1 拿到httpClient对象

2 创建请求方式对象(需要访问路径) httpGet（）

3 httpClient对象使用execute执行请求对象

4 得到返回对象，从返回对象上拿到返回码

5 对返回码进行判断

6 从返回对象上拿到返回值

Get

StringBuilder sb = new StringBuilder(path);

if(!params.isEmpty()){

sb.append("?");

for (Map.Entry<String, String> entry : params.entrySet()) {

String key = entry.getKey();

String value = entry.getValue();

sb.append(key).append("=").append(value);

sb.append("&");

}

sb.deleteCharAt(sb.length() - 1);

}

// 可以看作浏览器

HttpClient httpClient = new DefaultHttpClient();

HttpGet request = new HttpGet(sb.toString());

// 执行请求

try {

HttpResponse response = httpClient.execute(request);

StatusLine line = response.getStatusLine();

int statueCode = line.getStatusCode();

if(statueCode == HttpStatus.SC_OK)｛

HttpEntity entity = response.getEntity();

InputStream is = entity.getContent();

ByteArrayOutputStream bos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while((len = is.read(buffer))!=-1)

{

bos.write(buffer, 0, len);

}

String data = bos.toString();

flag = data.equals("success")?true:false;

}

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Post

HttpClient httpClient = new DefaultHttpClient();

HttpPost request = new HttpPost(path);

// 执行请求

// 请求实体 NameValuePair

List<NameValuePair> parameters = new ArrayList<NameValuePair>();

for(Map.Entry<String, String> entry:params.entrySet())

{

String name = entry.getKey();

String value = entry.getValue();

NameValuePair nvp = new BasicNameValuePair(name, value);

parameters.add(nvp);

}

UrlEncodedFormEntity uefe = new UrlEncodedFormEntity(parameters);

// 发送请求实体

request.setEntity(uefe);

HttpResponse response = httpClient.execute(request);

StatusLine line = response.getStatusLine();

int statueCode = line.getStatusCode();

if(statueCode == HttpStatus.SC_OK)

{

HttpEntity entity = response.getEntity();

InputStream is = entity.getContent();

ByteArrayOutputStream bos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while((len = is.read(buffer))!=-1)

{

bos.write(buffer, 0, len);

}

String data = bos.toString();

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