Java获取请求头、参数、路径方式

//请求头
MultivaluedMap<String, String> headers = containerRequestContext.getHeaders();
//路径参数
MultivaluedMap<String, String> pathParam = containerRequestContext.getUriInfo().getPathParameters();
//queryParam
MultivaluedMap<String, String> queryParam = containerRequestContext.getUriInfo().getQueryParameters();
// 路径
String path = containerRequestContext.getUriInfo().getPath(true).toLowerCase();

// MultiValueMap 一个 key 可以对应多个 value
MultiValueMap<String, String> map = new LinkedMultiValueMap<>();
map.add("name", "小明");
map.add("name", "小红");
System.out.println(map.toString());
// Map 一个 key 对应一个 value 
Map<String, String> hashMap = new HashMap<String, String>();
hashMap.put("name", "小明");
hashMap.put("name", "小红");
System.out.println(hashMap.toString());

--------------output---------------
{name=[小明, 小红]}
{name=小红}

// 获取所有header
Map<String, String> headerMap = new HashMap<>();
Enumeration enumeration = httpServletRequest.getHeaderNames();
while (enumeration.hasMoreElements()) {
String name = enumeration.nextElement();
String value = httpServletRequest.getHeader(name);
headerMap.put(name, value);
}

// 获取所有参数
Map<String, String> parameterMap = new HashMap<>();
Enumeration enumeration = httpServletRequest.getParameterNames();
while (enumeration.hasMoreElements()) {
String name = enumeration.nextElement();
String value = httpServletRequest.getParameter(name);
parameterMap.put(name, value);
}

// 获取boby
InputStream inputStream = null;
try {
    inputStream = httpServletRequest.getInputStream();
    StringBuilder babyStr = new StringBuilder();
    byte[] b = new byte[4096];
    for (int n; (n = inputStream.read(b)) != -1; ) {
        babyStr.append(new String(b, 0, n));
    }
    System.out.println(babyStr);
} catch (IOException e) {
    e.printStackTrace();
} finally {
    if (null != inputStream) {
        try {
            inputStream.close();
        } catch (IOException e) {
                    e.printStackTrace();
        }
    }
}

 // 二进制读取 获取boby
int len = httpServletRequest.getContentLength();
byte[] buffer = new byte[len];
ServletInputStream in = null;
try {
    in = httpServletRequest.getInputStream();
    in.read(buffer, 0, len);
    in.close();
} catch (IOException e) {
    e.printStackTrace();
} finally {
    try {
        in.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

request.getServletPath()
request.getPathInfo()
request.getContextPath()
request.getRequestURI()
request.getRequestURL()
request.getServletContext().getRealPath()