spring oauth2 的测试代码

错误信息：org.springframework.web.util.NestedServletException: Request processing failed; nested exception is error="invalid_request", error_description="Missing grant type"

错误代码配置：

@Autowired
    protected WebApplicationContext wac;

    @Autowired
    protected FilterChainProxy springSecurityFilterChain;

    protected MockMvc mockMvc;

    @Before
    public void prepare1() {
        mockMvc = MockMvcBuilders.webAppContextSetup(wac)
                .addFilter(springSecurityFilterChain).build();
    }

    protected void auth(OAuth2Form oAuth2Form) throws Exception {

        OAuth2Token authToken = JsonUtil.readValue(mockMvc.perform(post(SecurityConstants.DEFAULT_OAUTH_TOKEN_URL)
                .contentType(MediaType.APPLICATION_JSON_UTF8)
                .header("Authorization", AUTHORIZATION)
                .content(oAuth2Form.toString()))
                .andExpect(status().isOk())
                .andReturn().getResponse().getContentAsString(), new TypeReference<OAuth2Token>() {
        });
        assertNotNull(authToken);
        RegistrationMockJunit.authToken = authToken;
    }

错误原因：该代码使用post并且使用json的格式来认证用户，我的应用代码中有一个过滤器。它的作用是读取post的APPLICATION_JSON_UTF8数据转成APPLICATION_FORM_URLENCODED（oauth2不支持APPLICATION_JSON_UTF8）。当使用junit的时候没有进入那个过滤器，因为过滤器是保存在ApplicationFilterChain中的，不是保存在FilterChainProxy，使用junit的时候ApplicationFilterChain将替换成MockFilterChain，所以有以上的错误。

解决办法将代码采用APPLICATION_FORM_URLENCODED格式提交

protected void auth(OAuth2Form oAuth2Form) throws Exception {

        OAuth2Token authToken = JsonUtil.readValue(mockMvc.perform(post(SecurityConstants.DEFAULT_OAUTH_TOKEN_URL)
                .contentType(MediaType.APPLICATION_FORM_URLENCODED)
                .header("Authorization", AUTHORIZATION)
                .params(oAuth2Form.convert()))
                .andExpect(status().isOk())
                .andReturn().getResponse().getContentAsString(), new TypeReference<OAuth2Token>() {
        });
        assertNotNull(authToken);
        RegistrationMockJunit.authToken = authToken;
    }




    @Getter
    public static class OAuth2Form implements Serializable {
        @JsonProperty("grant_type")
        private String grantType;
        private String username;
        private String password;
        private String scope;

        public OAuth2Form(String grantType, String username, String password, String scope) {
            this.grantType = grantType;
            this.username = username;
            this.password = password;
            this.scope = scope;
        }

        public OAuth2Form(String username, String password) {
            this.grantType = "password";
            this.username = username;
            this.password = password;
            this.scope = "all";
        }

        public String toString() {
            try {
                return JsonUtil.serialize(this);
            } catch (IOException e) {
                return "";
            }
        }

        public MultiValueMap<String, String> convert(){
            MultiValueMap<String, String> result = new LinkedMultiValueMap<>();
            result.add("grant_type", this.grantType);
            result.add("username", this.username);
            result.add("password", this.password);
            result.add("scope", this.scope);
            return result;
        }
    }