Javaweb对接Unity(二）

一、验证码

这期要从Javaweb传一张图片到Unity,先上Java代码

/**
     * 返回验证码图片
     */
    private void identity(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //resp.setContentType("image/jpg");
        OutputStream os = resp.getOutputStream();
        //==把验证码放入Session
        //从请求中获取session
        HttpSession session = req.getSession();
        //生成图片输出到 响应的输出流 并返回生成的字符串
        // GifCaptcha gifCaptcha=new GifCaptcha();
        MathPngCaptcha captcha = new MathPngCaptcha(180, 80);
        String identityKey = captcha.out(os);
        //把数据放入session中  key,value
        // session.setAttribute("identityKey", identityKey);
        session.setAttribute(ProjectParam.SESSION_IDENTITY_KEY, identityKey);
        System.out.printf("验证码:%s\n", identityKey);
        //记得关闭流
        os.flush();
        os.close();
    }

上面是一个返回验证码 图片的类

然后再到C#代码，方法路径要对应设置TomCat的路径，上期讲过这里就不讲了

private string identityUrl = "http://127.0.0.1:8080/PensionSystem/LoginServlet?method=identity&";
 
private void Start() {
    StartCoroutine(ServletJsp(identityUrl));
}
 
IEnumerator ServletJsp(string path){
    DownloadHandlerTexture downloadTexture = new DownloadHandlerTexture(true);
    request.downloadHandler = downloadTexture;
    yield return request.SendWebRequest();
 
    if (request.error != null)
    {
        Debug.Log(request.error);
    }
    else
    {
        identityImage.texture = downloadTexture.texture;
        Debug.Log(downloadTexture.texture);
    }
}

这里图片用的是RawImage，然后identityImage.texture = downloadTexture.texture接收

在开始的时候用start()执行

这样就可以得到验证码图片了 

补充一个重要的点，需要在Java这边设置跨域，不然 session会出问题

public class SimpleCORSFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        Filter.super.init(filterConfig);
    }
 
 
 
    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        // 指定允许其他域名访问
        response.setHeader("Access-Control-Allow-Origin", "*"); // 允许所有
        // response.setHeader("Access-Control-Allow-Origin", "http://127.0.0.1, http://locahost"); // 允许白名单IP
        // 响应类型
        response.setHeader("Access-Control-Allow-Methods", "*");
        // 预检请求的结果缓存60分钟
        response.setHeader("Access-Control-Max-Age", "3600");
        //响应头设置
        response.setHeader("Access-Control-Allow-Headers", "*");
 
        response.setHeader("Access-Control-Allow-Credentials", "true");
        chain.doFilter(req, res);
    }
 
    @Override
    public void destroy() {
        Filter.super.destroy();
    }
}