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cnblogs.com/blog/1312938/201908/1312938-20190823180242513-433063641.png) 如果是POST请求，就需要我们去设定了  ### RequestBody解析 首先我们看一下RequestBody如何初始化？？拿提交表单举例： ``` RequestBody requestBody = new FormBody.Builder() .add("username", "qinzishuai") .add("password", "000000") .build(); ``` 不出所料，也是Builder模式，而且`RequestBody` 是抽象类， `FormBody`是`RequestBody`的其中一种实现类 ，另一个实现类是`MultipartBody` RequestBody源码如下： ``` public abstract class RequestBody { /** Returns the Content-Type header for this body. */ public abstract @Nullable MediaType contentType(); /** * Returns the number of bytes that will be written to {@code sink} in a call to {@link #writeTo}, * or -1 if that count is unknown. */ public long contentLength() throws IOException { return -1; } /** Writes the content of this request to {@code sink}. */ public abstract void writeTo(BufferedSink sink) throws IOException; /** * Returns a new request body that transmits {@code content}. If {@code contentType} is non-null * and lacks a charset, this will use UTF-8. */ public static RequestBody create(@Nullable MediaType contentType, String content) { Charset charset = Util.UTF_8; if (contentType != null) { charset = contentType.charset(); if (charset == null) { charset = Util.UTF_8; contentType = MediaType.parse(contentType + "; charset=utf-8"); } } byte[] bytes = content.getBytes(charset); return create(contentType, bytes); } /** Returns a new request body that transmits {@code content}. */ public static RequestBody create( final @Nullable MediaType contentType, final ByteString content) { return new RequestBody() { @Override public @Nullable MediaType contentType() { return contentType; } @Override public long contentLength() throws IOException { return content.size(); } @Override public void writeTo(BufferedSink sink) throws IOException { sink.write(content); } }; } /** Returns a new request body that transmits {@code content}. */ public static RequestBody create(final @Nullable MediaType contentType, final byte[] content) { return create(contentType, content, 0, content.length); } //省略部分代码... } ``` 核心方法有三个： - contentType()//数据类型 - contentLength()//数据长度 - writeTo(BufferedSink sink) //写操作 今天就讲到这里，希望对大家有所帮助... 大家可以关注我的微信公众号：「秦子帅」一个有质量、有态度的公众号！ 
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