Question

我有一个生成sql文件的应用程序，我的问题是当我尝试下载文件并且请求中有重音时我得到以下结果：

delete from gfe_param_fa where parfa_ident=9 and parfa_code_doc='ANNEXEC17' and parfa_libelle_doc='Dde certificat d''hérédité' and parfa_interaction='NON' and parfa_identifiant='POLICE' and parfa_remise='LETTRE' and parfa_application='ANNEXE_CO' and nvl(parfa_tri1,'NULL') = 'NULL' and nvl(parfa_tri2,'NULL') = 'NULL' and nvl(parfa_tri3,'NULL') = 'NULL' and parfa_archivage='OUI' and parfa_chemise='ANNEXE_GESTION' and parfa_type_appli_au='CL' and parfa_application_cl='ANNEXE_CO' and nvl(parfa_application_au,'NULL') = 'NUL

而不是

delete from gfe_param_fa where parfa_ident=9 and parfa_code_doc='ANNEXEC17' and parfa_libelle_doc='Dde certificat d''hérédité' and parfa_interaction='NON' and parfa_identifiant='POLICE' and parfa_remise='LETTRE' and parfa_application='ANNEXE_CO' and nvl(parfa_tri1,'NULL') = 'NULL' and nvl(parfa_tri2,'NULL') = 'NULL' and nvl(parfa_tri3,'NULL') = 'NULL' and parfa_archivage='OUI' and parfa_chemise='ANNEXE_GESTION' and parfa_type_appli_au='CL' and parfa_application_cl='ANNEXE_CO' and nvl(parfa_application_au,'NULL') = 'NULL';

我已将问题的原因分离到重音符号;只要请求中没有重音，就不会发生这种情况。

这是我的下载功能：

public void download(String request) throws IOException {
    FacesContext fc = FacesContext.getCurrentInstance();
    ExternalContext ec = fc.getExternalContext();
    BufferedInputStream input = null;
    BufferedOutputStream output = null;
    try {
        input = new BufferedInputStream(new ByteArrayInputStream(
                request.getBytes()), DEFAULT_BUFFER_SIZE);
        ec.responseReset();
        ec.setResponseContentType("application/sql");
        ec.setResponseContentLength(request.length());
        ec.setResponseHeader("Content-Disposition",
                "attachment; filename=\"" + "update.sql" + "\"");
        ec.setResponseHeader("Refresh", "1; url = main.xhtml");
        output = new BufferedOutputStream(ec.getResponseOutputStream(),
                DEFAULT_BUFFER_SIZE);

        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
        int length;
        while ((length = input.read(buffer)) > 0) {
            output.write(buffer, 0, length);
        }
        output.flush();
    } finally {
        close(output);
        close(input);
    }
    fc.responseComplete();
}

Answer 1

看看这个：

ec.setResponseContentLength(request.length())

和这个

input = new BufferedInputStream(new ByteArrayInputStream(
            request.getBytes()), DEFAULT_BUFFER_SIZE);

这些行一起构成了这个bug。

第二行给你多少字节，是否等于字符串中的字符数？不。 “request.getBytes（）”使用默认编码返回字符串的字节，默认编码取决于平台。（它将随OS / JVM /语言等而改变）。另一方面，对于给定的字符串，request.length（）将始终相同。

相反，你想要：

 // explicit character encoding, so it never changes
byte[] requestBytes = request.getBytes("UTF-8");

然后使用该字节数组初始化您的流和以确定内容长度。

由于重音而文件被截断

1 个答案: